Loss of the Heating System of the Left Fixed Window

TASK 30-42-00-810-812-A
Loss of the Heating System of the Left Fixed Window

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 30-42-00-710-001	Operational Test of the Windshield Anti-Icing and Defogging
AMM 30-42-34-000-001	Removal of the Window Heat Computer (WHC)
AMM 30-42-34-400-001	Installation of the Window Heat Computer (WHC)
AMM 56-11-12-000-001	Removal of the Fixed Windows
AMM 56-11-12-400-002	Installation of the Fixed Windows
L Fixed Window Electrical Connector with 2 sensors
L Fixed Window Electrical Connector with 3 sensors
Heating Coat Resistance Versus Temperature - Fixed Window - P/N SPSA320 series 2 (with 2 sensors)
Heating Coat Resistance Versus Temperature - Fixed Window - P/N SPSA320 series 3 (with 3 sensors)
Heating Coat Resistance Versus Temperature - Fixed Window - P/N 165313 series
Heating Coat Resistance Versus Temperature - Fixed Window - P/N NH25216 series

3. Fault Confirmation
Subtask 30-42-00-710-072-A

A. Test
(1) Do the operational test of the windshield anti-icing and defogging AMM 30-42-00-710-001.

4. Fault Isolation
Subtask 30-42-00-810-061-A

A. If the test gives the maintenance message L FIXED WINDOW:

disconnect the connector from the L fixed window (7DG1) and do a check of the resistance between pin A and pin B.

NOTE: For left fixed window P/N SPSA320 series 2 (with 2 sensors),

For left fixed window P/N SPSA320 series 3 (with 3 sensors),

For left fixed window P/N 165313 series,

For left fixed window P/N NH25216 series,

(1) If the resistance is not correct:

(2) If the resistance is correct:
(a) Replace the WHC-1 [2DG1] , AMM 30-42-34-000-001 and AMM 30-42-34-400-001.
(b) If the fault continues:

do a check and repair the wiring from the WHC 1 (2DG1) to the L fixed window (7DG1) pin B/H to pin A/A.

Subtask 30-42-00-710-073-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:42 UTC