NUMBER
APPROVAL
REFERENCE
(otherdocuments)
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-------
03/19/87 Untted States Environmental Protection Agency
Washington, D.C. 20460
EPA OSWER Directive Initiation Request
2. Originator Information
Name of Contact Person Mafl Code Office
DORRLER OERR/HRSD/
1. Directive Number
9285.2-01
Telephone Number
340-6740
3. Title
FIELD STANDARD OPERATING PROCEDURES MANUALS: FSOP #4 -
SITE ENTRY
4. Summary of Directive (Include brief statement of purpose)
Provides site entry procedures that field response
personnel can use to minimize the risk of exposure
to hazardous substances. (1/85, 38 pp)
5. Keywords
SUPERFUND, CERCLA, SITE SAFETY, EMPLOYEE HEALTH
PROCEDURES
6a. Does this Directive Supercede Previous Directives)?} | yes | X] No
AND SAFETY
What directive (number, title)
b. Does it Supplement Previous Directives^)? | yes |, _x| No What directive (number, title)
7. Draft Level
A-StgnedbyAA/DAA " B - Signed by Office Director I C- For Review 1
This Request Meets OSWER Directives System Format
8. Signature of Lead Office Directives Coordinator
9. Name and Title of Approving Official
HEDEMAN
k Comment I In Development
Date
Date
01/01/85
OSWER OSWER OSWER
DIRECTIVE DIRECTIVE
-------
OSWER Directive 9285-2-01
FIELD STANDARD OPERATING PROCEDURES
FOR
SITE ENTRY
F.S.O.P. 4
U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF EMERGENCY AND REMEDIAL RESPONSE
HAZARDOUS RESPONSE SUPPORT DIVISION
WASHINGTON, D.C. 20460
1/85
-------
The mention of" trace names or commercial products in tnis manual is
for illustration purposes ana does not constitute endorsement or
recomnienaation for use oy tne Environmental Protection Agency.
Contents of tnis manual do not necessarily reflect tne views ana
policies of tne Environmental Protection Agency.
1/85
-------
TABLE OF CONTENTS
I. INTRODUCTION
Objectives 1
Background 1
Brief Description of Site Entry Procedures 1
Site Level Determination 1
Selection of Sampling Equipment 2
II. PERSONAL PROTECTIVE EQUIPMENT 3
Level A Protection 3
Level B Protection 4
Level C Protection 5
Level D Protection 6
III. INITIAL SURVEYS 8
IV. FLOW CHARTS FOR SITE ENTRY 9
Level A Entry 9
Level B Entry 10
Level C Entry 11
V. PROCEDURES FOR DONNING PROTECTIVE EQUIPMENT 12
Level A Donning 12
Level B Donning 13
Level C Donning 14
VI. PROCEDURES FOR DOFFING PROTECTIVE EQUIPMENT 15
Level A Doffing and Decon 15
Level B Doffing and Decon 18
Level C Doffing and Decon . 21
VII. SUMMARY OF FIELD EQUIPMENT 24
VIII. SCBA CHECKOUT PROCEDURES 29
1/85
-------
SECTION I
INTRODUCTION
1/85
-------
F.S.O.P. #4
PROCESS: SITE ENTRY
I. Oojectives
Tnis document provides site entry procedures tnat field response
personnel can use to minimize tne risk of exposure to nazardous
suostances.
II. Sackgrouna
Tnese proceoures nave oeen derived by reorganizing the U.S.
Environmental Protection Agency, Office of Emergency ana
Remedial Responses (US EPA, OERR), Wasnington, DC. "Standard
Operating Safety Guides", Novemoer 1984, into a format more
appropriate for use in tne fiela at nazardous materials
responses.
III. Brief Description of Site Entry Procedures
1. Personnel Entry
Personnel entering sites of nazardous suostance inciaents must
use adequate safety precautions to minimize exposure to a host
of contaminants wnicn may nave long term or immediate nealtn
affects. These precautions include selecting and properly using
ana decontaminating personal protective equipment. Eacn site is
separate ana aistinct as is each site entry. The EPA (OERR) has
aesignatea levels of protection, oasea on site cnaracteristics,
for tneir own use. In situations wnere the'type(s) of
cnemical(s), conceritration(s), and possioilities of contact are
not well cnaracterized, experienced professionals must select
tne appropriate level of protection cased on potential exposure,
unti i tne nazaras can oe oetter characterized.
2. Protective Equipment Level
The EPA (OERR) nas classified the equipment to protect tne body
against contact with known or potential chemical hazards- into
four categories accoroing to tne degree of protection afforded:
a. Level A: Affords tue highest available level of
respiratory, sicin, and eye protection.
o. Level 8: Affords tne highest level of respiratory
protection, out a lesser level of skin protection. Level B
protection is the minimum level recommended on initial site
entries until tne nazards nave oeen further defined by
on-site studies.
Page
1/35
-------
F.S.O.P. * 4
c. Level C; Afforos appropriate protection wnen tne type(s) of
liroorne substance(s) is Known, tne concentration(s) is
measured, and experienceu professionals judge that the criteria
for using air-purifying respirators are met.
d. i.eve'1 D: Afforos minimal protection. Level D is primarily a
worn uniform and should not oe worn on any site with respiratory
or skin hazards.
3. Selection of Level of Protection
The Level of Protection selected snould be cased primarily on
tne following:
Type(s) and measured concentration(s) of tne chemical
suostance(s) in tne ambient atmosphere and its toxicity.
Potential exposure to suostances in air, splasnes of liquids, or
otner direct contact with material due to worn being performed.
4. Selection of Sampling Equipment
Sampling equipment used on site should be selected to meet the
following criteria:
- Provides information useful for protecting personnel.
- Is convenient to use and maintain.
- Is disposaole if possiole.
- Can be flagged witn plastic to avoid the need for
decontamination.
- Will not initiate on explosion if used in an explosive
atomosphere.
- Can be easily decontaminated.
Page 2
i/as
-------
SECTION II
PERSONAL PROTECTIVE
EQUIPMENT
1/65
-------
F.S.O.P. # 4
PROCESS: SITE ENTRY
III. Levels of Protection
A. Level A Protection
I. Personal protective equipment
Supplied-air respirator approved oy the Mine Safety and
Healtn Administration (MSHA). and National Institute of
Occupational Safety ana Healtn (NIOSH).
Respirators may oe:
pressure-demand, self-contained oreatning apparatus
(SCBA)
or
pressure-demand, airline respirator (with escape
oottle for Immediately Dangerous to Life and Healtn
(IDLh) or potential for ILDH atmosphere)
Fully encapsulating cnemicai-resistant suit
Coveralls*
Long cotton unuerwear*
Gloves (inner), cnemicai-resistant
Boots, cnemicai-resistant, steel toe ana snanx (Depending
on suit construction, worn over or under suit boot)
Hard nat* (unaer suit)
Disposaole gloves ana ooot covers* (Worn over fully
encapsulating suit)
Cooling unit*
2-Way radio communications (innerently safe)
2. Criteria for selection
Meeting any of trie following criteria warrants use of Level A
Protection:
Tne cneimcal suostance(s) nas oeen identified and requires
tne nignest level of protection for sxin, eyes, and tne
respiratory system cased on:
measured (or potential for) nign concentrations of
atmospneric vapors, gases, or particulates
'Optional Page 3
1/85
-------
F.S.O.P. #4
or
site operations and work functions involves hign
potential for splash, immersion, or exposure to un-
expected vapors, gases, or particulates of materials
nignly toxic to tne skin.
Suustances with a high degree of hazard to the skin are
known or suspected to be present, and skin contact is
possible.
Operations must oe conducted in confined, poorly ventilated
areas until the aosence of hazards requiring Level A
protection is determined.
Direct readings on field Flame lonization Detectors (FID)
or Pnotoionization Detectors (PID) and similar instruments
indicate m'gn levels of unidentified vapors and gases in
tne air.
B. Level 6 Protection
1. Personal protective equipment
- Suppliea-air respirator (MSHA/NIOSH approved).
Respirators may oe:
-- pressure-demand, self-contained oreatning apparatus
or
-- pressure-demand, airline respirator (witn escape bottle
for IOLH or potential for IDLH atmosphere)
Cnemical-resistant clothing (overalls and long-sleeved
jacxet; nooaed, one or two-piece cnemical-splash -suit;
disposable chemical-resistant, one-piece suits)
Long cotton underwear*
Coveralls*
Gloves (outer), cnemical-resistant
Gloves (inner), cnemical-resistant
Boots (outer), cnemical-resistant, steel toe and snanic
Boots (outer), cnemical-resistant (disposable)*
Hard nat (face snield)*
2-Way raaio communications (intrinsically safe)
Optional Page 4
1/85
-------
F.S.O.P. #4
2. Criteria for selection.
Meeting any one of these criteria warrants use of Level B
protection:
Tne type ana atmosprieric concentration of toxic substances
have been identified and requires a nigh level of
respiratory protection, out less s*in protection than Level
A. These would oe atmospheres:
witn concentrations Immediatly Dangerous to Life and
Healtn, out substance or concentration in the air does
not represent a severe SKin nazard
or
that do not meet the selection criteria permitting the
use of air-purifying respirators.
The atmosphere contains less than ly.5X oxygen.
It is nignly unlikely tnat the woric being done will
generate nigh concentrations of vapors, gases or
particulates, or splasnes of material tnat will affect tne
snin of personnel wearing Level B protection.
Atmospneric concentrations of unidentified vapors or gases
are indicated u-y direct readings o'n instruments such as tne
FID or PID or similar instruments, out vapors and gases are
not suspected of containing high levels of cnemicals toxic
to SKin.
C. Level C Protection
1. Personal protective equipment
Air-purifying respirator, full-face, canister-equipped
(MSHA/NIOSH approved)
Chemical-resistant clothing (coveralls; hooded, one-piece
or two piece chemical splash suit; chemical-resistant hood
ana apron; disposable cnemical-resistant coveralls)
Coveralls*
Long cotton underwear*
Gloves (outer), cnernical-resistant
Gloves (inner), cnemical-resistant
Boots (outer), cnemical-resistant, steel toe ana snanK*
Page 5
-------
F.S.O.P. *4
Boots (outer), cfiemical-resistant, (disposaole)*
Boot covers (outer), chemical-resistant (disposable)*
Hard nat (face shield*)
Escape mas**
2-Way raaio communications* (innerently safe)
2. Criteria for selection
Meeting any of tne following criteria permits use of Level C
protection:
Oxygen concentrations are not less than 19.51 oy volume.
Measured air concentrations of identified substances will
oe reduced oy tne respirator oelow tne suostance's
tnresnold limit value (TLV) and the concentration is witnin
tne service limit of the canister.
Atmospneric contaminant concentrations do not exceed IDLH
levels.
Atmospneric contaminants, liquid splashes, or other direct
contact will not aaversely affect the small area left
unprotected oy cnemical-resistant clotning.
Joo functions ao not require self-contained breatning
apparatus.
Direct readings are a few ppms above oackground on
instruments sucn as tne FID or PID. (See Appendices I and
II.)
D. Level D Protection
1. Personal protective equipment
Coveralls
Gloves*
Boots/shoes, leather or chemical-resistant, steel toe and
snanic
Safety glasses or cnemical splasn goggles*
Hard nat (face snield)*
*0ptional
Page 6
1/85
-------
F.S.O.P. *4
'i. Criteria for selection
Meeting any of the following criteria allows use of Level D
protection:
- . No contaminants are present.
- Worx functions preclude splashes, immersion, or potential for
unexpected innalation of any cnemicals.
Level D protection is primarily a work uniform. It can be worn
only in areas wnere tnere is no possioility of contact with
contamination.
Page 7
1/85
-------
SECTION III
INITIAL SURVEYS
1/85
-------
F.S.O.P. §4
PROCESS: SITE ENTRY
III. INITIAL SURVEYS
In general, tne initial entry is considered a relatively rapid
screening process for collecting preliminary data on site
nazaras.
Of immediate concern to initial entry personnel are atmospneric
conditions *nicn coula affect tneir immediate safety. Tnese
conditions are: airoorne toxic suostances, comoustiole gases or
vapors, UCK of oxygen, and to a lesser extent, ionizing
raaiation. Priorities for monitoring tnese potential hazards
snould oe estaolished after a careful evaluation of conditions.
Page 8
1/85
-------
1
t -
F.S.O.P. No. 4
PROCESS SITE ENTRY
SITE ENTRY - LEVEL A PROTECTION
A EXCLUSION ZONE
Flow Sheet
SITE ENTRY
DOUBLE BAG ALL NON-
DISPOSABLE SAMPLING
EQUIPMENT AS WELL AS
ELECTRICAL AND CAMERA
EQUIPMENT
TEST EQUIPMENT TO SEE
IF FUNCTIONING PROPERLY
CALIBRATE EQUIPMENT
WARM UP EQUIPMENT IF
NECESSARY
LABEL ALL SAMPLING
CONTAINERS
SET UP DECONTAMINATION
STATIONS FOR SAMPLING
EQUIPMENT BEFORE MOVING
EQUIPMENT INTO EXCLUSION
ZONE (SEE FSOP #7)
EQU
I
0.
0
0
CONTAMINATION
0 REDUCTION
ZONE
0
0
0
t
IPMENT P
*0rder may be reversed depending on suit type.
t
Mil
^^
MUj
^^
0
0
^^
0
0
0
0
0
0
0
t
ERSONN
Steps
adjacent to the contamination reduction zone.
SITE ENTRY
COMPLETE CLOSING SUIT
CONNECT BREATHING HOSE/OPEN
MAIN LINE
CLOSE ALL FASTENERS EXCEPT
NEAR BREATHING HOSE
GET INTO SLEEVES & DON SUIT
PUT ON INNER GLOVES
OPEN VALVE TO AIR TANK
DON FACEPIECE
DON SC8A
PUT ON BOOTS*
STEP INTO LEGS OF SUIT*
APPLY ANTIFOG/NOSE CUP
SUPPORT
ZONE
EL
#1-11 may be done outside but
°age q
1/85
-------
I
r*
SECTION IV
FLOW CHARTS
FOR
SITE ENTRY
1/85
-------
F.S.O.P. No. 4
PROCESS SITE ENTRY
SITE ENTRY - LEVEL B PROTECTION
Flow Sheet
SITE ENTRY
DOUBLE BAG ALL NON-
DISPOSABLE SAMPLING
EQUIPMENT AS WELL AS
ELECTRICAL AND CAMERA
EQUIPMENT
TEST EQUIPMENT TO SEE
IF FUNCTIONING PROPERLY
CALIBRATE EQUIPMENT
WARM UP EQUIPMENT IF
NECESSARY
LABEL ALL SAMPLING
CONTAINERS
SET UP DECONTAMINATION
STATIONS FOR SAMPLING
EQUIPMENT BEFORE MOVING
EQUIPMENT INTO EXCLUSION
ZONE (SEE FSOP #7)
EQU
1 EXCLUSION
0 l
0 l
0
0
0
0 CONTAMINATION
REDUCTION
ZONE
0
I
ZONE
4
1
IT]
TO}
0
0
0
0
CD
0
0
0
0
t
SITE ENTRY
CONNECT BREATHING TUBE WHILE
OPENING MAIN LINE VALVE
PUT ON HOOO 4 SECURE
DON SC8A AND FACEMASK*
TAPE GLOVES TO SUIT
PUT ON OUTER GLOVES
PUT ON INNER GLOVES
TAPE BOOTIES TO SUIT
PUT ON BOOTS AND LATEX BOOTIES
DON CHEMICAL SUIT
APPLY ANTIFOG/NOSE CUP
SUPPORT
ZONE
IPMENT PERSONNEL
Steps fl-11 may be done outside but adjacent to
the contamination reduction zone.
*May be donned before outer gloves.
Page 1
1/85
-------
F.S.O.P. No. 4
PROCESS SITE ENTRY
Flow Sheet
SITE ENTRY
A
SITE ENTRY - LEVEL C PROTECTION
EXCLUSION ZONE
O SITE ENTRY
0
PUT ON HOOO & SECURE
DOUBLE BAG ALL NON-
DISPOSABLE SAMPLING
8 DON FACEPIECE
EQUIPMENT AS WELL AS
ELECTRICAL AND CAMERA
EQUIPMENT
TEST EQUIPMENT TO SEE
IF FUNCTIONING PROPERLY
CALIBRATE EQUIPMENT
WARM UP EQUIPMENT IF
NECESSARY
LABEL ALL SAMPLING
CONTAINERS
SET UP DECONTAMINATION
STATIONS FOR SAMPLING
EQUIPMENT BEFORE MOVING
EQUIPMENT INTO EXCLUSION
ZONE (SEE FSOP #7)
0
^^
0CONTAMINATION
REDUCTION
ZONE
0
0
0
t
1
0
^ '
0
0
0
0
|
1
TAPE GLOVES TO SUIT
PUT ON INNER AND OUTER GLOVES
TAPE BOOTIES TO SUIT
DON SPLASH SUIT AND LATEX*
BOOTIES
DON STEEL-TOED BOOTS*
APPLY ANTIFOG/NOSE CUP
CONNECT CANISTER TO FACEPIECE
SUPPORT
ZONE
EQUIPMENT PERSONNEL
'Boots donned first only when using dispensable coveralls with attached booties.
Steps #1-11 may be done outside but adjacent to the contamination reduction zone.
Page 11
1/85
-------
SECTION VII
SUMMARY
OF
FIELD EQUIPMENT
1/85
-------
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Page 23
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F.S.O.P. *4
PROCESS: SITE ENTRY
IV. SUMMARY OF FIELD EQUIPMENT
A. Initial Site Entry
The initial on-site entry is to determine, on a preliminary oasis,
hazardous or potentially nazaraous conditions. The main effort is to
rapialy identify tne immediate nazaras tnat may affect the public,
response personnel, and the environment. Of major concern are the real
or potential aangers - for example, fire, explosion, oxygen-deficient
atmospheres, radiation, airoorne contaminants, containerized or pooled
nazaraous suostances tnat could affect workers during subsequent
operations.
1. Organic Vapors and Gases
If tne type(s) of organic substance(s) involved in an incident is
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1
F.S.O.P. **
C. Radiation
Altnough radiation monitoring is not necessary for all responses, it
snould be incorporated in tne initial survey where radioactive
materials may be present - for example, fires at warehouses or
hazardous material storage facilities, transportation incidents
involving unknown materials, or aoandoned waste sites.
Normal gamma radiation background is approximately 0.01 to 0.02
mi lliroentgen per hour (mR/nr) on a gamma survey instrument. Wortc
can continue with elevated radiation exposure rates; however, if tne
exposure rate increases two times aoove gamma oacicground, a qualified
healtn pnysicist should oe consulted. At no time should work
continue with an exposure rate of 10 mR/nr or above without the
advice of a healtn pnysicist. EPA's Office of Air, Noise, ana
Radiation has radiation specialists in each Region, as well as at
facilities in Montgomery, Alabama, and Las Vegas, Nevada, to assist.
The absence of gamma readings above oackground should not oe
interpreted as tne complete aosence of radioactivity. Radioactive
materials emitting alpha, or beta radiation may be present, but
virtually all alpha ana beta emitters tnat you can reasonably expect
to ue found at incident sites will also oe gamma emitters and
therefore be measured witn tne gamma survey.
'.*%"..
U. Oxygen Deficiency
At sea level, ambient air contains at least ly.5% oxygen by volume.
At lower percentages, air-supplied respiratory protective equipment
is needed. Oxygen measurements are of particular importance for worK
in enclosed spaces, low-lying areas, or in the vicinity of accidents
tnat nave produced neavier-than-air vapors, wnicn could displace
amoient air. These oxygen-deficient areas are also prime locations
for taking further organic vapor ana combustible gas measurements,
since the air tnat nas been displaced by other substances will affect
tne readings of some instruments (e.g. combustible gas meters need
normal oxygen levels for accurate results). Oxygen-enricned
atmospneres increase tne potential for fires.
E. Combustible Gases
Tne presence or absence of combustible vapors or gases must be
determined. If readings approacn or exceed 10X of the lower
explosive limit (LEL), extreme caution should oe exercised in
continuing the investigation. If readings approacn or exceed 25X
LEL, personnel snould oe withdrawn immediately. Before resuming any
on-site activities, project personnel in consultation with experts in
fire or explosion prevention must develop procedures for continuing
operations. Also, levels in this range are sure to oe quite high
witn respect to initial action exposure limits.
Page 25
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F.S.O.P. »*
F. Visual ODservations
While on-site, tne initial entry team snould make visual ooservations
which would nelp in evaluating site nazards - for example, dead fisn
or otner animals; land features; wind direction; labels on containers
indicating explosive, flammaole, toxic, or corrosive material;
conditions conuucive to splasn or contact with unconfined liquids,
sludges, or solids; and otner general conditions.
G. Direct-Reading Instruments
A variety of airoorn toxics, (including organic and inorganic vapors,
gases, or particulates) can be produced at, for example, aoandoned
waste sites; fires at cnemical manufacturing, storage, reprocessing,
or formulating facilities; or fires involving pesticides.
Direct-reading field instruments will not detect or measure all of
these suostances. Thus, negative readings snould not be interpreted
as the complete aosence of airoorne toxic substances. Verification
of negative results can only be aone Dy collecting air samples and
analyzing tnem in a laooratory.
H. Altnough it may seem tnat the process of transporting sampling
equipment into a nazardous waste site would primarily rely on common
sense, there are some general guidelines wnich should be followed.
Tnese are:
1. Set up decontamination stations for sampling equipment oefore
moving equipment into contaminated area, (see FSOP f7)
2. Laoel all sampling containers.
3. Warm up equipment if necessary.
4. Caliorate equipment oefore and after use.
5. Test equipment to see if it is functioning properly.
6. Douole bag all non-disposaole sampling equipment as well as
electrical and camera equipment.
Page 26
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F.S.O.P. #4
TABLE 4-1
ATMOSPHERIC HAZARD GUIDELINES
Monitoring Equipment
Hazara
Amoient Level
Action
Comoustiole gas indicator
Explosive
atmospnere
Oxygen concentration meter Oxygen
Radiation survey
Radiation
Co 1 orimetric tuoes
Organic and
inorganic
vapors/gases
lUX LEL Continue investigation
10X-25X Continue on-site
monitoring witn extreme
caution as higner levels
are encountered.
25% LEL Potential explosion
hazard; withdraw from
area .immediately.
19.5X Monitor wearing SCBA.
NOTE: Comoustiole gas
readings are not valid
in atmospneres witn less
tnan 19.52 oxygen.
19.5-25X Continue investigation
witn caution. SC8A not
needed, cased on oxygen
content only.
Discontinue inspection;
fire nazard potential.
Consult specialist.
1 mR/hr Continue investigation.
If radiation is detected
aoove oackground levels,
the presence of possible
radiation sources is
indicated; at this
level, more thorough
monitoring is advisable.
Consult with a health
physicist.
10 mR/hr Potential radiation
nazard; evacuate site.
Continue monitoring only
upon the advice of a
health physicist.
Depends on Consult standard
species reference manuals for
air concentrations/
toxicity aata.
Page IT
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F.S.O.P. #4
TABLE 4-1 (Continued)
HNU pnotoionizer
Pnotoionization detector
Organic vapor analyzer/
Flame ionization detector
Organic
vapors/gases
Organic
1) Depends on Consult standard
species reference manuals for
air concentrations/
toxicity data.
2) Total
response
mode
1) Depends on
species
2) Total
response
mooe
Consult EPA Standard
Operating Procedures.
Consult standard
reference manuals for
air concentratons/
toxicity data.
Consult EPA Standard
Operating Procedures.
Page 28
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SECTION VIII
SCBA CHECKOUT PROCEDURES
1/85
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F.S.O.P. f4
PROCESS: SITE ENTRY
I. INTRODUCTION
SC8A CHECKOUT PROCEDURES
Before a self-contained oreatning apparatus can oe usea, it must be
properly inspected. Botn of tne cnecKlists tnat follow can nelp
ensure proper inspection. Tne first cnecxlist is for
pressure-demand SC8A units witn no mode-select lever, sucn as tne
MSA 401. Tne second cneciUist is for SCBAs witn mode-select levers,
sucn as Scott Airpaxs and Survivair units. ,iote tnat botn
cnecK lists indicate tnat inspection steps mariced M are requirea
monthly ratner tnan prior to eacn use.
II. PRESSURE-DEMAND SCBA WITHOUT MODE SELECT LEVER
Prior to starting on cnecxlist, make sure tnat:
- Hign-pressure nose connector is tignt on cylinder fitting.
- Bypass valve is closed.
- Mainl.ine valve is closea.
- Regulator outlet is not covered or obstructed.
A. Back Pacx and Harness Assemoly
1. Straps
a. Visually inspect for complete set.
b. Visually inspect for frayed or aamaged straps.
2. BucKles
a. Visually inspect for mating enas.
0. CnecK 1ocxing function.
3. 8acx Plate and Cylinder LOCK
a. Visually inspect back plate for cracKS and missing
rivets or screws.
o. Visually inspect cylinder nold-down strap. Physically
cnecx tne strap tightener and locx to assure tnat it is
fully engaged.
Page 29
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