EQUIP/FURNIS - DOOR AREA HEATING - FWD EMER EXIT - All heated floor panels are INOP

TASK 25-27-00-810-812-A
EQUIP/FURNIS - DOOR AREA HEATING - FWD EMER EXIT - All heated floor panels are INOP

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-56-55-000-002	Removal of the Contactor Located in the Panel 200VU
AMM 24-56-55-400-002	Installation of the Contactor Located in the Panel 200VU
AMM 25-27-00-740-001	Bite Test of the Heated Floor Panel System
ASM 252701
ASM 252702
AMM 25-27-34-000-001	Removal of the Control Unit 4DS, 14DS
AMM 25-27-34-400-001	Installation of the Control Unit 4DS, 14DS

3. Fault Confirmation
Subtask 25-27-00-740-068-A ** ON A/C NOT FOR ALL

A. Do the Bite Test of the Heated Floor Panel System AMM 25-27-00-740-001.

4. Fault Isolation
Subtask 25-27-00-810-071-A ** ON A/C NOT FOR ALL

A. If the test indicators on the control unit 4DS do not come on:

(1) If there is no 115 VAC:

Do a check of the aircraft wiring between the electrical connector 4DS-A, pin 14 and the circuit breaker 1DS, pin 2 ASM 252701 or ASM 252702.

(a) If there is continuity:

(b) If there is no continuity:

(2) If there is 115 VAC:

(a) If there is no 28 VDC:

Do a check of the aircraft wiring from the electrcal connector 4DS-A, pin 16 to the circuit breaker 3DS, pin 2 ASM 252701 or ASM 252702.

1 If there is no continuity:

Replace the CONTACTOR, GALLEY PWR -A- [6MC] AMM 24-56-55-000-002 and AMM 24-56-55-400-002.

a If the fault continues:

2 If there is continuity:

(3) If there is 28 VDC:

Replace the CTL UNIT-DOOR AREA HEATING [4DS] AMM 25-27-34-000-001 and AMM 25-27-34-400-001.

Subtask 25-27-00-740-069-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:27:01 UTC