Emergency Exit Overwing Battery Pack Installation 506
33-51-31 Figure 201 Feb 15/69
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EMERGENCY EXIT OVERWING LIGHT BATTERY PACK - REMOVAL/INSTALLATION
1. General
A. Access to either overwing light battery pack is obtained by removing an access panel in aft cargo compartment sidewall (station 727A, right and left sides).
2. Remove Battery Pack
A. Verify that emergency lights switch on pilots' overhead panel is set to OFF.
B. Open EMERG LTS POWER and EMERG LTS CONTROL circuit breakers on P18 circuit breaker panel.
C. Remove cable assembly (Fig. 401.)
D. Remove four retaining screws and remove battery pack.
3. Install Battery Pack
A. Install battery pack with four retaining screws. Ensure batteries are in pack (Fig. 401.)
B. Install cable assembly.
C. Close EMERG LTS POWER and EMERG LTS control circuit breakers on P18 circuit breaker panel.
D. Test battery pack operation.
(1) Momentarily set emergency lights switch on either pilot's overhead or aft attendant's panel to ON then return switch to prior setting. Check that lights powered by battery pack come on and go off.
CAUTION: RETURN SWITCH TO OFF POSITION AS SOON AS POSSIBLE TO CONSERVE BATTERIES.
E. Install access panel in aft cargo compartment.
527
Feb 15/72 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-51-31 Page 401
Emergency Exit Overwing Battery Pack Installation 512
33-51-31 Figure 401 Feb 15/71
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SELF-ILLUMINATING SIGNS - MAINTENANCE PRACTICES
1. General (Fig. 201)
A. Self illuminating signs are provided to indicate certain emergency egress routes and actuating equipment. These include signs such as: overwing escape hatch handle marker, some slide actuation handles, and all (nonelectric) exit signs. These signs contain radioactive tritium gas filled capsules. The gas is at approximately sea level atmospheric pressure. The capsules are cushioned by a silicone rubber adhesive and embedded in the durable plastic rectangle that makes up the sign. Normal handling or slight abuse will not damage sign.
B. The radioactive tritium gas presents no radiological health hazard when signs are intact. However, if the signs are cracked or broken the radioactive gas may escape, thus presenting a health hazard if the material is inhaled or absorbed into the body. Minor scratches, nicks, etc., on sign do not present any hazard.
C. Special procedures should be followed in the handling of signs.
(1)
Airplane air distribution system should be operating during the handling of self-illuminating signs to dissipate radioactive gas in case of breakage.
(2)
Disposal of signs is subject to the control of radiation protection personnel who must comply with the governmental regulations.
(3)
Storage of signs should always be in protective containers placed in a well ventilated area such as an open shelf.
(4)
The original manufacturer is the only company authorized to alter these signs in any manner.
2. Inspection/Check Self-Illuminating Signs (Fig. 201)
A. General
(1) Total darkness is preferred for sign luminescence check. If total darkness is not feasible, partial darkness and an opaque shield may be used to prevent external light from impinging on sign.
502
Aug 15/80 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-51-41 Page 201
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