506
28-11-0 Page 840 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/98
CURE TEMP CURE CONDITION
(°F) DRY HARD *[1] DRY THROUGH *[2]
75 +5 100 +5 125 +5 150 +5 24 Hrs 5 Hrs 2.5 Hrs 0.75 Hrs 72 Hrs 8 Hrs 4 Hrs 2.5 Hrs
*[1] Condition where metal chips and/or filings will not adhere to the sealant.
*[2] Condition where the sealant is hard enough to resist damage when walked on with boot socks.
506 BMS 5-81 Cure Rates
Nov 15/77 Figure 828 28-11-0
Page 841
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
WING FUEL TANK ACCESS PANELS - REMOVAL/INSTALLATION
1. General
A. The elliptical-shaped access panels, No. 1 thru 13 (Fig. 401), provide access to internal structure or equipment inside tanks No. 1 and 2. Circular-shaped access panels No. 14 serve as the air vent scoop for the fuel vent system as well as providing access to the outboard portion of each surge tank. Mounting details, and sealing gaskets are different for the two types of access panels.
2. Removal/Installation of Access Panels 1 thru 13 (Fig. 401)
A. Equipment and Materials
(1)
Anticorrosion Grease -MIL-G-25537 or equivalent (Ref 20-30-21, Lubricants)
(2)
Aliphatic Naphtha -TT-N-95
B. Prepare Fuel Tank Access Panel for Removal
(1)
Defuel applicable tank (Ref 28-23-0 MP). Purge tank if entry is planned (Ref 28-10-0 MP).
WARNING: DO NOT COMPROMISE THE SAFETY PRECAUTIONS GIVEN FOR PURGING AND FUEL TANK ENTRY.
(2)
On panels equipped with measuring sticks, pull measuring stick out to its limiting stop.
C. Remove Fuel Tank Access Panel
(1)
If removing access panel with surge tank flame arrestor pressure relief valve installed (panel No. 13, Fig. 401) (All airplanes incorporating SB28-1026 or SB28-1131), ensure relief valve is in open position (Ref 28-13-41 R/I)
WARNING: DO NOT ATTEMPT TO REMOVE ACCESS PANEL WITH RELIEF VALVE IN CLOSED POSITION. VALVE OPENING MECHANISM CONTAINS A POWERFUL, FAST ACTING SPRING CAN EASILY BE UNLATCHED CAUSING SEVERE INJURY IF FINGERS ARE CAUGHT BETWEEN VALVE PARTS. A LOUD, STARTLING NOISE IS NORMAL WHEN VALVE OPENS.
(2)
Support clamp ring and remove mounting screws (Fig. 401). Place screws in a container.
(3)
Remove clamp ring and knitted aluminum gasket, and place in flat container. Use care in handling.
(4)
Push up on access panel and remove from fuel tank. On access panels with surge tank flame arrestor pressure relief valve installed, use slot cutouts in skin to guide access panel from surge tank.
CAUTION: DO NOT PRY OFF PANEL. IF PANEL STICKS, LOOSEN BY TAPPING AROUND EDGE WITH RUBBER MALLET.
THE LOWER SURFACE OF THE ACCESS PANEL FLANGE AND THE UPPER SURFACE OF THE SKIN AROUND THE ACCESS PANEL OPENING ARE SEALING SURFACES. DO NOT SCRATCH OR DAMAGE.
HANDLE ACCESS PANEL WITH RELIEF VALVE INSTALLED (NO. 13) WITH CARE OR DAMAGE TO SENSITIVE RELIEF VALVE MAY OCCUR.
(5) Install rubber protector around wing skin access panel opening.
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D. Prepare Fuel Tank for Access Panel Installation
(1)
Check open tank for foreign material such as tools, metal cuttings, and any other debris.
(2)
Clean open tank, as necessary, then proceed with access panel installation.
E. Prepare Fuel Tank Access Panel for Installation
(1)
Remove rubber protector from access panel opening.
(2)
Thoroughly clean access panel opening and access panel sealing surface using a clean lint-free cloth moistened with naphtha.
(3)
Clean clamp ring and knitted aluminum gasket using a clean lint-free cloth moistened with naphtha.
(4)
Check lip and skin around access panel opening for corrosion. If corrosion is found, refer to Structural Repair Manual.
(5)
Check knitted aluminum gasket for serviceability.
(a) If gasket is not servicable, replace as follows: 1) Place aluminum gasket carrier tray package face up on a flat surface. 3) Position clamp ring over gasket (countersunk end of holes face up) so that
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