Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door

TASK 57-17-11-000-001-B
Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door

WARNING: THIS PROCEDURE USES A FUEL SYSTEM ITEM THAT IS IN A CATEGORY KNOWN AS A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL). CDCCL IDENTIFIES AN ITEM THAT CAN BE THE SOURCE OF A POSSIBLE FUEL TANK IGNITION. YOU MUST KEEP ALL CDCCL ITEMS IN THE APPROVED CONFIGURATION. DAMAGE, WEAR OR CHANGES TO A CDCCL ITEM CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

WARNING: MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE.

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

ZONE: 147
ZONE: 148

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
148	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-869-001-A	Fuel Transfer
TASK 28-25-52-000-003-A	Removal of the Additional Center Tank (ACT) Refuel-Valve Canister
TASK 28-28-11-000-001-A	Removal of the ACT Fuel-Transfer-Pump Pressure-Switch
TASK 28-28-31-000-001-A	Removal of the ACT Fuel-Transfer-Pump Mounting-Plate
TASK 28-28-33-000-001-A	Removal of the ACT Fuel Transfer-Valve
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 57-17-11-000-003-A	Removal of the Protective Cover of the ACT-Equipment Support Door
Access Cover 148AZ
Warning Placards on the Center Wing BOX
ACT-Equipment Support Door

3. Job Set-up
Subtask 57-17-11-010-053-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Open the MLG doors and install the safety devices (Ref. AMM TASK 32-12-00-010-001).
(2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at zone 147 or 148.
(3) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 57-17-11-650-053-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001), (Ref. AMM TASK 28-10-00-910-001).
(2) Defuel the center tank (Ref. AMM TASK 28-25-00-650-001) or move the fuel into a different tank (Ref. AMM TASK 28-25-00-869-001).
(3) Drain the remaining fuel in the center tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 57-17-11-865-066-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FUEL/X FEED/VALVE/MOT1	2QE	A12
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L24
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L23
** ON A/C NOT FOR ALL
121VU	FUEL/L WING TK/PUMP2 SPLY	7QA	N26
121VU	FUEL/L WING TK/PUMP1 SPLY	1QA	N23
121VU	FUEL/R WING TK/PUMP2 SPLY	8QA	Q26
121VU	FUEL/R WING TK/PUMP1 SPLY	2QA	Q23
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L23
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L22

Subtask 57-17-11-865-056-A

DELETED

4. Procedure
Subtask 57-17-11-020-052-B ** ON A/C NOT FOR ALL

A. Removal of Access Cover 148AZ

Access Cover 148AZ ** ON A/C NOT FOR ALL

WARNING: MAKE SURE THAT THE WARNING/CAUTION PLACARDS ARE INSTALLED AND YOU CAN EASILY READ THEM. THESE PLACARDS TELL PERSONS THAT THERE IS A POSSIBLE LOW OXYGEN CONTENT IN:

THE AREA BEHIND THE ACCESS PANEL(S)
THE ADJACENT AREAS WHEN THE ACCESS PANEL(S) IS(ARE) OPEN.

IF THE PLACARDS ARE DAMAGED, MISSING OR PAINTED OVER, YOU MUST REPLACE THEM. THESE PLACARDS ARE RELATED TO A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL).

(1) Do a visual inspection to look for placards that are:

Damaged
Missing
Painted over.

(2) Make sure that you can easily read the placard message.

Warning Placards on the Center Wing BOX ** ON A/C NOT FOR ALL

(3) If the placards are damaged, missing, painted over or you cannot easily read them, replace them at the next maintenance opportunity.
(4) Remove the bolt (13), the washer (14) and disconnect the bonding strip (15).
(5) Remove the screws (16), the washers (17) and the washers (18).
(6) Remove the access cover (11).

NOTE: Hold the access cover (11) in position when you remove the fasteners.

(7) Remove and discard the seal (12).

Subtask 57-17-11-020-053-C ** ON A/C NOT FOR ALL

B. Removal of the ACT-Equipment Support Door

ACT-Equipment Support Door ** ON A/C NOT FOR ALL

WARNING: MAKE SURE THAT THE WARNING/CAUTION PLACARDS ARE INSTALLED AND YOU CAN EASILY READ THEM. THESE PLACARDS TELL PERSONS THAT THERE IS A POSSIBLE LOW OXYGEN CONTENT IN:

THE AREA BEHIND THE ACCESS PANEL(S)
THE ADJACENT AREAS WHEN THE ACCESS PANEL(S) IS(ARE) OPEN.

IF THE PLACARDS ARE DAMAGED, MISSING OR PAINTED OVER, YOU MUST REPLACE THEM. THESE PLACARDS ARE RELATED TO A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL).

(1) Do a visual inspection to look for placards that are:

Damaged
Missing
Painted over.

(2) Make sure that you can easily read the placard message.

Warning Placards on the Center Wing BOX ** ON A/C NOT FOR ALL

(3) If the placards are damaged, missing, painted over or you cannot easily read them, replace them at the next maintenance opportunity.
(4) Remove the protective cover (Ref. AMM TASK 57-17-11-000-003).
(5) Remove the following components:

the fuel transfer pump 163QM (Ref. AMM TASK 28-28-31-000-001)
the refuel valve canister 164QM (Ref. AMM TASK 28-25-52-000-003)
the fuel transfer valve 165QM (Ref. AMM TASK 28-28-33-000-001)
the pressure switch 2QH (Ref. AMM TASK 28-28-11-000-001).

(6) Remove the screw (27), the washer (26), the bonding strip (25) and disconnect the bonding strip (28).
(7) Remove the screw (30), the washer (32) and disconnect the bonding strip (29).
(8) Remove the screw (39), the washer (40) and disconnect the bonding strip (38).
(9) Remove the screw (36), the washer (35), the bonding strip (38) and disconnect the bonding strip (37).
(10) Remove the bolts (21), the washers (22), the washers (23) and the fittings (24), (31) and (41).
(11) Remove the ACT-equipment support door (34).

NOTE: Hold the ACT-equipment support door (34) in position when you remove the bolts (21).

(12) Remove and discard the seal (33).

[Rev.10 from 2021] 2026.04.01 02:08:45 UTC