Replacement of the Relay 98QH

TASK 28-28-00-920-002-A
Replacement of the Relay 98QH

ZONE: 120

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
822

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	RELAY	AIPC 28-28-08-01-040
2	RELAY	AIPC 28-28-88-01-030

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 28-28-00-710-006-A	Operational Test of the ACT Vent Valve Actuator
Relay 98QH

3. Job Set-up
Subtask 28-28-00-860-183-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network (Ref. AMM TASK 24-42-00-861-001).
(2) Put the WARNING NOTICE(S) on the panels that follow, to tell persons not to operate refuel/defuel system:

Refuel/defuel panels 800VU and 801VU
Fuel panel 40VU
Additional Center Tank (ACT) fuel control panel 28VU.

Subtask 28-28-00-865-120-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/ACT AIR SOV/MAN/SPLY	64QH	J20
121VU	FUEL/ACT AIR SOV/AUTO/SPLY	63QH	J19
121VU	FUEL/ACT VENT VLV/MAN/SPLY	62QH	L21
121VU	FUEL/ACT VENT VLV/AUTO/SPLY	61QH	L20

Subtask 28-28-00-010-094-A ** ON A/C NOT FOR ALL

C. Get access to the avionics compartment.
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE at avionics compartment door 822.
(2) Open access door 822 of the avionics compartment.
(3) Open the access panel of electronic rack 103VU.

4. Procedure
Subtask 28-28-00-020-054-A ** ON A/C NOT FOR ALL

A. Removal of Relay 98QH
(1) Loosen the screws (1) and remove the relay (2) from the base (3).

Subtask 28-28-00-420-054-A ** ON A/C NOT FOR ALL

B. Installation of the Relay 98QH
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Install a new AIPC 28-28-08-01-040 RELAY (2)AIPC 28-28-88-01-030 RELAY (2) on the base (3).

Subtask 28-28-00-865-121-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/ACT AIR SOV/MAN/SPLY	64QH	J20
121VU	FUEL/ACT AIR SOV/AUTO/SPLY	63QH	J19
121VU	FUEL/ACT VENT VLV/MAN/SPLY	62QH	L21
121VU	FUEL/ACT VENT VLV/AUTO/SPLY	61QH	L20

Subtask 28-28-00-710-074-A ** ON A/C NOT FOR ALL

D. Operational Test
(1) Do the operational test of ACT vent-valve actuator 91QH (Ref. AMM TASK 28-28-00-710-006).

5. Close-up
Subtask 28-28-00-410-074-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Close the access panel of electronic rack 103VU.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the access door 822 of the battery compartment.

Subtask 28-28-00-860-184-A ** ON A/C NOT FOR ALL

B. Put the aircraft back to the serviceable condition.
(1) Remove the warning notices from:

Refuel/defuel panels 800VU and 801VU
Fuel control panel 40VU
Additional Center Tank (ACT) fuel control panel 28VU.

(2) Remove the access platform(s).
(3) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:17:47 UTC