Cold Temperature in the Cockpit Foot Area

TASK 21-41-00-810-801-A
Cold Temperature in the Cockpit Foot Area

1. Possible Causes

wiring
HEATER-AIR OUTLET, L [3HE]
HEATER-AIR OUTLET, R [4HE]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 24-00-00-810-803-A	Circuit Breaker Tripped and/or C/B TRIPPED Warning
AMM 21-41-00-720-001	Functional Test of the Foot Air-Outlet Heater
ASM 214101
AMM 21-41-51-000-001	Removal of the Air Outlet Heater
AMM 21-41-51-400-001	Installation of the Air Outlet Heater

3. Fault Confirmation
Subtask 21-41-00-710-050-A ** ON A/C NOT FOR ALL

A. Do the functional test of the window air-outlet heater AMM 21-41-00-720-001.

4. Fault Isolation
Subtask 21-41-00-865-050-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	CKPT/FOOT/HEATERS	1HE	V23

Subtask 21-41-00-810-050-A ** ON A/C NOT FOR ALL

B. If the air blown in the cockpit is too cold, make sure that the CKPT/FOOT/HEATERS circuit breaker (1HE) is closed.
(1) If the circuit breaker is open:

Do the procedure (Ref. TSM TASK 24-00-00-810-803).

(2) If the circuit breaker is closed:

Do a check for 115VAC at the pin A/A of the left air-outlet heater (3HE) and the pin A/A of the right air-outlet heater (4HE).

(a) If there is no 115VAC:

Repair the wiring ASM 214101.

(b) If there is 115VAC:

Replace the defective HEATER-AIR OUTLET, L [3HE] or HEATER-AIR OUTLET, R [4HE] AMM 21-41-51-000-001 and AMM 21-41-51-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:24:45 UTC