Functional Test of the Maintenance Sockets

TASK 33-37-00-720-001-A
Functional Test of the Maintenance Sockets

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: MAKE SURE THAT THE NLG DOWNLOCK SAFETY PIN AND THE TWO DOOR SAFETY PINS ARE INSTALLED.

FIN: 3LL
FIN: 4LL

1. Reason for the Job
To make sure that the maintenance sockets operate correctly.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	MULTIMETER - STANDARD
No specific	1	STEPLADDER 2.0 M (6.6 FT)
98D32203502000	2	SAFETY PIN - NLG DOOR

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191MB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-410-001-A	Nose Gear Doors - Ground Doors Closing

3. Job Set-up
Subtask 33-37-00-861-051-A

A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 33-37-00-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/WHL WELL/LTG/OUT	1LL	X07

Subtask 33-37-00-010-052-A

C. Get Access
(1) Open the nose gear doors for access (Ref. AMM TASK 32-22-00-010-001).
(2) Depressurize the Green, Yellow and Blue hydraulic systems (Ref. AMM TASK 29-10-00-864-001) (Ref. AMM TASK 29-10-00-864-002) (Ref. AMM TASK 29-10-00-864-003).
(3) Install the 98D32203502000 SAFETY PIN - NLG DOOR on the nose gear doors.

(a) FOR [3LL] (SOCKET)

(4) Put the STEPLADDER 2.0 M (6.6 FT) in position in zone 123.

(a) FOR [4LL] (SOCKET)

(5) Open the access panel 191MB.
(6) Use the MULTIMETER - STANDARD for this test.

4. Procedure
Subtask 33-37-00-720-050-A

A. Test of the Maintenance Sockets
(1) Do this test.

ACTION	RESULT
1.On the electrical combination panel 2025VU: measure the output voltage between the connections + and N on the maintenance socket 4LL.	On the multimeter: the output voltage is 28 V DC.
2.In the nose wheel well compartment zone 123: measure the output voltage between the connections + and N on the maintenance socket 3LL.	On the multimeter: the output voltage is 28 V DC.

5. Close-up
Subtask 33-37-00-410-051-A

A. Close Access
(1) Remove the multimeter.
(2) Remove the SAFETY PIN - NLG from the nose gear door (Ref. AMM TASK 32-22-00-410-001).
(3) Remove the stepladder.
(4) Pressurize the Yellow hydraulic system to close the nose gear doors.
(5) Make sure that the work area is clean and clear of tools and other items.
(6) Close the nose gear doors (Ref. AMM TASK 32-22-00-410-001).
(a) FOR [4LL] (SOCKET)
(7) Close the access panel 191MB.

Subtask 33-37-00-862-051-A

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:54:38 UTC