Deactivation of the Heated Floor Panels (HFP)

TASK 25-27-00-040-801-A
Deactivation of the Heated Floor Panels (HFP)

ZONE: 100
ZONE: 200
FIN: 15DS ** ON A/C NOT FOR ALL
FIN: 16DS ** ON A/C NOT FOR ALL
FIN: 30DS ** ON A/C NOT FOR ALL
FIN: 31DS ** ON A/C NOT FOR ALL
FIN: 32DS ** ON A/C NOT FOR ALL
FIN: 33DS ** ON A/C NOT FOR ALL
FIN: 5DS ** ON A/C NOT FOR ALL
FIN: 6DS ** ON A/C NOT FOR ALL

1. Reason for the Job
This procedure tells you how to manually isolate a defective HFP.
To do this procedure, refer to the FAA Reference: MMEL TASK: 252701 - Heating Function of HFPs (Passenger/Crew Doors, Emergency Exits and Galley Areas) (FAA only).

NOTE: This deactivation task is not related to an AFM-CDL/MMEL item for all aircraft under EASA or CAAC regulation.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
100	LOWER HALF FUSELAGE INCLUDING RADOME
200	UPPER HALF FUSELAGE

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 25-27-00-00	ANCILLARY EQUIPMENT - DESCRIPTION AND OPERATION

3. Job Set-up
Subtask 25-27-00-861-053-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-41-00-861-002).
(2) For the location of this component, refer to Para. Component Location (Ref. AMM D/O 25-27-00-00).

4. Procedure
Subtask 25-27-00-865-060-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	DOOR AREA HTG PANELS-CTL	54DS	A07
2000VU	DR AREA HTG PNLS-DR1-FPH-RH	52DS	A06
2000VU	DR AREA HTG PNLS-DR1-FPH-LH	51DS	A05
** ON A/C NOT FOR ALL
2000VU	DR AREA HTG PNLS-CTL	3DS	F08
2000VU	DR AREA HTG PANELS-DR2-FPH	1DS	F07
** ON A/C NOT FOR ALL
2000VU	DR AREA HTG PNLS-DOOR1-FPH-RH	52DS	F06
2000VU	DR AREA HTG PNLS-DOOR1-FPH LH	51DS	F05
** ON A/C NOT FOR ALL
2000VU	DR AREA HTG PANELS-DR2-HTR	1DS	A08
2000VU	DR AREA HTG PANELS-DR2-CTL	3DS	A06
** ON A/C NOT FOR ALL
2001VU	DOOR AREA HTG PNL-DOOR3-HTR	11DS	F05
2001VU	DR AREA HTG PNLS-DOOR 3-CTL	13DS	F03

Subtask 25-27-00-040-050-A ** ON A/C NOT FOR ALL

B. Deactivation of the HFP at Door 1
(1) Remove the related fuse from the applicable control unit:

HFP 30DS (RH-A) / Control Unit 66DS - Heater 1
HFP 31DS (LH-A) / Control Unit 60DS - Heater 1
HFP 32DS (RH-B) / Control Unit 66DS - Heater 2
HFP 33DS (LH-B) / Control Unit 60DS - Heater 2.

(2) Install a blanking cap on the related fuse socket.
(3) Install a grey Inoperative (INOP) label adjacent to the related LED light/fuse on the control unit.
(4) Make an entry in the logbook that the related HFP is isolated.

Subtask 25-27-00-040-051-A ** ON A/C NOT FOR ALL

C. Deactivation of the HFP at the Emergency Exit Doors
(1) Remove the related fuse from the applicable control unit:
(a) For Door 2 Area:

HFP 5DS (LH) / Control Unit 4DS - Heater 1
HFP 6DS (RH) / Control Unit 4DS - Heater 2.

(b) For Door 3 Area:

HFP 15DS (LH) / Control Unit 14DS - Heater 1
HFP 16DS (RH) / Control Unit 14DS - Heater 2.

Subtask 25-27-00-040-051-B ** ON A/C NOT FOR ALL

C. Deactivation of the HFP at the Emergency Exit Doors
(1) Remove the related fuse from the applicable control unit:

HFP 15DS (LH) / Control Unit 14DS - Heater 1
HFP 16DS (RH) / Control Unit 14DS - Heater 2.

Subtask 25-27-00-865-062-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	DOOR AREA HTG PANELS-CTL	54DS	A07
2000VU	DR AREA HTG PNLS-DR1-FPH-RH	52DS	A06
2000VU	DR AREA HTG PNLS-DR1-FPH-LH	51DS	A05
** ON A/C NOT FOR ALL
2000VU	DR AREA HTG PNLS-CTL	3DS	F08
2000VU	DR AREA HTG PANELS-DR2-FPH	1DS	F07
** ON A/C NOT FOR ALL
2000VU	DR AREA HTG PNLS-DOOR1-FPH-RH	52DS	F06
2000VU	DR AREA HTG PNLS-DOOR1-FPH LH	51DS	F05
** ON A/C NOT FOR ALL
2000VU	DR AREA HTG PANELS-DR2-HTR	1DS	A08
2000VU	DR AREA HTG PANELS-DR2-CTL	3DS	A06
** ON A/C NOT FOR ALL
2001VU	DOOR AREA HTG PNL-DOOR3-HTR	11DS	F05
2001VU	DR AREA HTG PNLS-DOOR 3-CTL	13DS	F03

5. Close-up
Subtask 25-27-00-862-053-A ** ON A/C NOT FOR ALL

A. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:32:49 UTC