CAUTION
IF YOU REPLACE A PANEL THAT HAS A DOUBLER (194AL, 194BL,
194AR, 194BR), YOU MUST INSTALL A NEW PANEL WITH A NEW
DOUBLER. MAKE SURE THAT YOU INSTALL IT CORRECTLY. IF YOU
INSTALL THE DOUBLERS INCORRECTLY, DAMAGE TO THE
EQUIPMENT CAN OCCUR.
(d) If access panels 194AL, 194AR, 194BL, or 194BR are replaced and have a doubler, do
the following:
NOTE: The same thickness doubler and nylon liner should be used and edges sealed
with sealant. This makes an aerodynamic and a weather seal.
1) Install a new doubler and nylon at STA 727.
2) Fay seal doubler to fairing panel.
3) Make sure that the seal compression is within limits of operation and trailing edge
flaps are within limits (TASK 27-51-00-820-801).
4) Apply sealant, A02315 to make a fillet seal around edge of doubler.
SUBTASK 53-51-21-400-002
CAUTION
INSTALL THE BONDING BOLTS IN THE SAME FASTENER HOLES THAT YOU
REMOVED THEM FROM. BONDING BOLTS CAN HELP TO PREVENT
LIGHTNING DAMAGE. LIGHTNING CAN CAUSE DAMAGE TO THE
AIRPLANE.
(2) Install the designated bonding fasteners for the applicable panel.
CAUTION
DO NOT APPLY CORROSION-PREVENTATIVE COMPOUND TO THE
BOND-BOLTS AND THEIR HOLES. THE COMPOUND PREVENTS
CORRECT INSTALLATION OF THE BONDING BOLT. IF YOU DO NOT
INSTALL THE BONDING BOLT CORRECTLY, DAMAGE TO THE
AIRPLANE CAN OCCUR.
(a) Apply compound, C00528 to the fastener and its hole.
(b) Measure the maximum electrical resistance for each bonding fastener.
1) Refer to this task: Wing-To-Body Fairing Panel Maximum Electrical Resistance
Check, TASK 53-51-21-760-801.
a) Make sure that the resistance for each bonding fastener is not more than
300,000 ohms for these access panels:
• In Zone 194: 194AL, 194AR, 194BL, 194BR, 194CL, 194FL, 194FR
b) Make sure that the resistance for each bonding fastener is not more than 0.5
ohms for these access panels:
• In Zone 194: 194CR, 194DL, 194DR, 194E, 194GL, 194GR, 194HL, 194HR
(c) After you install the bonding fasteners, apply one coat of primer, C00175 as needed to
the bonding fasteners only.
SUBTASK 53-51-21-220-001
(3) Make sure that the distance between panels is in tolerance.
(a) Measure the misfair between the panels.
1) If you install access panels 194AL, 194AR, 194CL, 194CR, 194FL, or 194FR, make
sure that the joint misfair is within the range of 0.0600 in. (1.524 mm) +0.0400 in.
(1.016 mm) or -0.1000 in. (-2.5400 mm).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-51-21
Page 427
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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