Removal of the Static Inverter Contactor

TASK 24-28-55-000-001-A
Removal of the Static Inverter Contactor

CAUTION: MAKE SURE THAT NO AC OR DC POWER IS CONNECTED TO THE AIRCRAFT ELECTRICAL CIRCUITS. THERE IS A RISK OF DAMAGE TO EQUIPMENT DURING ITS REMOVAL/ INSTALLATION IF THE AC OR DC POWER STAYS CONNECTED.

ZONE: 126
FIN: 2XB

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 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
126	LATERAL AVIONIC COMPARTMENT
822

C. Referenced Information

REFERENCE	DESIGNATION
Static Inverter Contactor

3. Job Set-up
Subtask 24-28-55-941-050-A

A. Safety Precautions
(1) In the cockpit, on the overhead panel 35VU, release these pushbutton switches:

BAT 1, BAT 2,
GEN 1, GEN 2,
EXT A.

(2) In the cockpit, put a WARNING NOTICE(S) to tell persons not to operate the pushbutton switches on these overhead panels:

35VU (ELEC),
21VU (EMER ELEC PWR).

(3) Make sure that the external power connector is not connected to the aircraft receptacle EXT PWR A.
(4) Put a WARNING NOTICE(S) on the access door 121AL to tell persons not to connect the external power connector.
(5) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE at the avionics compartment door 822.

Subtask 24-28-55-010-050-B

B. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 822.
(2) Open the access door 822.
(3) In the avionics compartment, open the access door of the panel 105VU.

Subtask 24-28-55-869-050-B

C. Disconnect the Batteries
(1) In the avionics compartment, on the batteries 1 and 2:
(a) Loosen the knurled nut by one quarter of a turn and disconnect the connector from the batteries 1 and 2.
(b) Put CAP - BLANKING on the diconnected electrical connectors.

Subtask 24-28-55-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/HOT BUS/702PP SPLY	5PB2	D02
105VU	ELEC/HOT BUS/701PP SPLY	5PB1	D01
105VU	ELEC/STAT INV/CNTOR/CTL	14XB	G02
106VU	CSM/G /EV/MAN/SPLY	6XE	B04
122VU	ELEC/REFLNG/ON/BAT	1PR	U28

4. Procedure
Subtask 24-28-55-020-050-B

A. Removal of the Contactor

CAUTION: REMOVE THE CONTACTOR ONLY AND NOT THE BASE OR THE MODULE WHERE THE WIRES ARE CONNECTED.

(1) Disconnect the electrical connector (3).
(2) Put CAP - BLANKING on the connector (3) and the electrical receptacle (2).
(3) Loosen the 6 captive screws (4).

NOTE: Do not remove the captive screws (4) and the spring washers from the contactor (1).

(4) Disengage the contactor (1) from the base (7) and remove the contactor (1).

[Rev.10 from 2021] 2026.03.31 23:23:04 UTC