Installation of the Window Heat Computer (WHC)

TASK 30-42-34-400-001-A
Installation of the Window Heat Computer (WHC)

ZONE: 121
ZONE: 122
FIN: 2DG1
FIN: 2DG2

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
122	AVIONICS COMPARTMENT
811

C. Referenced Information

REFERENCE	DESIGNATION
TASK 30-42-00-710-001-A	Operational Test of the Windshield Anti-Icing and Defogging
Window Heat Computer (WHC)

3. Job Set-up
Subtask 30-42-34-860-050-A

A. Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position.

Subtask 30-42-34-010-051-A

B. Make sure that the access door 811 is open.

Subtask 30-42-34-865-051-A

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2DG1 (WHC1)
122VU	ANTI ICE/WINDOWS/L	4DG1	X14
122VU	ANTI ICE/WHC/1	5DG1	X13
123VU	ANTI ICE/L/WHSLD	1DG1	AF10
FOR FIN: 2DG2 (WHC2)
122VU	ANTI ICE/WINDOWS/R	4DG2	W14
122VU	ANTI ICE/WHC/2	5DG2	W13
123VU	ANTI ICE/R/WHSLD	1DG2	AF03

4. Procedure
Subtask 30-42-34-420-050-A

A. Installation of the Window Heat Computer (WHC)
(1) Install the WHC (3).
(2) Install the screws (2) and washers (1). Tighten the screws (2).
(3) Remove the blanking caps and connect the electrical connectors (4) and (5).

5. Close-up
Subtask 30-42-34-865-052-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2DG1 (WHC1)
122VU	ANTI ICE/WINDOWS/L	4DG1	X14
123VU	ANTI ICE/L/WHSLD	1DG1	AF10
FOR FIN: 2DG2 (WHC2)
122VU	ANTI ICE/WINDOWS/R	4DG2	W14
123VU	ANTI ICE/R/WHSLD	1DG2	AF03

Subtask 30-42-34-860-052-A

B. Circuit Breaker(s) Configuration
(1) After two seconds, remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s) that follow.

Subtask 30-42-34-865-053-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2DG1 (WHC1)
122VU	ANTI ICE/WHC/1	5DG1	X13
FOR FIN: 2DG2 (WHC2)
122VU	ANTI ICE/WHC/2	5DG2	W13

Subtask 30-42-34-710-050-A

D. Do an operational test of the cockpit windshield anti-icing and defogging system (Ref. AMM TASK 30-42-00-710-001)

Subtask 30-42-34-410-050-A

E. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 811.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 00:30:59 UTC