Installation of the Reheater

TASK 21-52-31-400-001-A
Installation of the Reheater

WARNING: MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.

NOTE: The procedure is the same for reheaters 10HM3 and 11HM3.

FIN: 10HM3
FIN: 11HM3

1. Reason for the Job
Two persons are necessary to do this task.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	PLUG - BLANKING
No specific	1	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.55 and 0.5 m.daN (48.67 and 44.25 lbf.in )
No specific	Torque wrench: range to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in )
No specific	Torque wrench: range to between 1.0 and 0.8 m.daN (88.50 and 70.80 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.03QBB9)	Dry lubricant-General Assembly Molybdenum Disulfide -
(Material No.03QBD1)	Dry lubricant-General Assembly Graphite -
(Material No.14QEB1)	Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
28	SEAL	AIPC 21-52-41-26-180
23	PACKING	AIPC 21-52-41-28-020
16	SEAL	AIPC 21-52-41-28-050
13	NUT	AIPC 21-52-41-28-060
14	WASHER	AIPC 21-52-41-28-070
32	PACKING	AIPC 21-61-03-05-040
32	PACKING	AIPC 21-61-83-13-040

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-33-21-618-001-A-01	Pre-conditioning through the HP Ground Connection
TASK 12-33-21-618-001-A-02	Pre-conditioning with the APU
TASK 20-26-00-910-002-A	Installation of Expansion Joints
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A	Bonding Surface Preparation
TASK 21-52-16-000-001-A	Removal of the Water Extractor
TASK 21-52-16-400-001-A	Installation of the Water Extractor
TASK 21-52-23-000-003-A	Removal of the Pipe Assembly between the Anti-Ice Valve (if installed) and the Bypass Air Duct of the Primary Heat Exchanger
TASK 21-52-23-400-003-A	Installation of the Pipe Assembly between the Anti-Ice Valve (if installed) and the Bypass Air Duct Duct of the Primary Heat Exchanger
TASK 21-63-00-710-004-A	Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
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 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A	Installation of the Quick-Release Access Panels on the Belly Fairing Structure
Reheater
Attachment Components - Reheater

3. Job Set-up
Subtask 21-52-31-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that:
(a) The aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(b) On the overhead panel, on AIR COND panel 30VU:
1 The APU BLEED pushbutton switch is released (the ON legend is off).
2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are released (the OFF legends are on).
3 The WARNING NOTICE(S) to tell persons not to operate these pushbutton switches is in position.
(c) On the HP ground connector make sure that the WARNING NOTICE(S) to tell persons not to supply ground air is in position.
(d) These access panels are removed from the belly fairing structure (Ref. AMM TASK 53-35-13-000-002):
1 FOR [10HM3] (REHEATER)

191KB.

2 FOR [11HM3] (REHEATER)

192KB.

(e) The water extractor is removed (Ref. AMM TASK 21-52-16-000-001):
1 FOR [10HM3] (REHEATER)

10HM8.

2 FOR [11HM3] (REHEATER)

11HM8.

(f) The pipe assembly is removed (Ref. AMM TASK 21-52-23-000-003).

Subtask 21-52-31-860-050-B ** ON A/C NOT FOR ALL

191KB.

2 FOR [11HM3] (REHEATER)

192KB.

(e) The water extractor is removed (Ref. AMM TASK 21-52-16-000-001):
1 FOR [10HM3] (REHEATER)

10HM8.

2 FOR [11HM3] (REHEATER)

11HM8.

Subtask 21-52-31-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 10HM3 (REHEATER)
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** ON A/C NOT FOR ALL
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP/CTL SYS1/1/28VDC	3HH	X21
122VU	AIR COND/PACK TEMP CTL SYS2/1/28VDC	4HH	Y19
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18
** ON A/C NOT FOR ALL
FOR FIN: 11HM3 (REHEATER)
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20

4. Procedure
Subtask 21-52-31-560-050-A

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

A. Preparation of the Replacement Component

Reheater

(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Clean the component interfaces and the adjacent area.
(3) Remove the PLUG-BLANKING from each disconnected line end.
(4) Remove and discard the lockwire from the temperature sensor (33).
(5) Remove the temperature sensor (33) and remove and discard the packing (32).
(6) Put the PLUG-BLANKING in each disconnected line end.

CAUTION: USE ONLY THE SPECIFIED LUBRICANT TO LUBRICATE THE O-RINGS AND THE PACKINGS. OTHER LUBRICANTS CAN CAUSE SMOKE OR A SMELL IN THE CABIN WHEN THEY BECOME HOT.

CAUTION: APPLY A SMALL QUANTITY OF THE CORRECT GREASE TO THE MALE THREADS OF THE CONNECTIONS. THIS WILL PREVENT DAMAGE TO THE THREADS. MAKE SURE THAT GREASE DOES NOT GO INTO THE PIPES. GREASE IN THE PIPES CAN CAUSE A MALFUNCTION OF THE SYSTEM.

(7) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the mating surfaces of the temperature sensor (33) and the new AIPC 21-61-03-05-040 PACKING (32) or AIPC 21-61-83-13-040 PACKING (32).
(8) Put the packing (32) in position on the temperature sensor (33).
(9) Install the temperature sensor (33) and torque to between 1.0 and 0.8 m.daN (88.50 and 70.80 lbf.in )

.
(10) Safety the temperature sensor (33) with 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
(11) Clean the unwanted grease from the temperature sensor (33).

Subtask 21-52-31-420-052-A

B. Installation of the Attachment Components

Attachment Components - Reheater

(1) Hold the support rods (77) and (81) in position in the brackets (20).
(2) Install the bushings (6), the bolts (7), the washers (5) and the nuts (4).
(3) Tighten the nuts (4).

Subtask 21-52-31-420-051-B ** ON A/C NOT FOR ALL

C. Installation of the Reheater

Reheater ** ON A/C NOT FOR ALL

CAUTION: USE ONLY THE SPECIFIED LUBRICANT TO LUBRICATE THE O-RINGS AND THE PACKINGS. OTHER LUBRICANTS CAN CAUSE SMOKE OR A SMELL IN THE CABIN WHEN THEY BECOME HOT.

(a) Apply the lubricant as follows:

Dry lubricant-General Assembly Molybdenum Disulfide - (Material No.03QBB9) is a powder. It is applied as a paste. To make a paste, mix the molybdenum disulfide powder with the pure water or the white spirit.
Apply a small quantity of Dry lubricant-General Assembly Molybdenum Disulfide - (Material No.03QBB9) or Dry lubricant-General Assembly Graphite - (Material No.03QBD1) to a new AIPC 21-52-41-28-020 PACKING (23).

NOTE: Dry lubricant-General Assembly Graphite - (Material No.03QBD1) is applied dry.

(7) Put the new AIPC 21-52-41-26-180 SEAL (28) in position in the sleeve (26) (Ref. AMM TASK 20-26-00-910-002) .
(8) Put the new AIPC 21-52-41-28-050 SEAL (16) in position in the sleeve (17) (Ref. AMM TASK 20-26-00-910-002) .
(9) Put the packing (23) in position on the ACM turbine inlet (24).
(10) Carefully put the reheater (12) in position in the sleeve (26) and on the ACM turbine inlet (24). Turn the sleeve (26) when you install the reheater (12) to prevent damage to the seal (28).
(11) Hold the reheater (12) and put the support rods (77) and (81) in position in the clevis (3).
(12) Install the bushings (6), bolts (7), washers (5) and nuts (4).
(13) Tighten the nuts (4).
(14) Put the clamp (22) in position.
(15) TORQUE the clamp to between 0.55 and 0.5 m.daN (48.67 and 44.25 lbf.in )

.
(16) Put the bonding strap (10) in position and install the screw (11), the washer (9) and the nut (8) (Ref. AMM TASK 20-28-00-912-802).
(17) Tighten the nut (8).
(18) Put the sleeve (17) in position on the flange (15). Turn the sleeve (17) when you install it to prevent damage to the seal (16).
(19) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the contact faces of the retaining cables (18) and (27).
(20) Make sure that the sleeves (17) and (26) are in the correct position.
(21) Install the clamps (35) on the pipe assemblies.

NOTE: Correct position of the clamp is between the end and first flange of the pipe assembly.

(22) Turn the screw of the clamps (35) to touch, then torque it to one more full turn.
(23) Put the retaining cables (18) and (27) in position in the flanges (15) and (29).
(24) Hold the hexagonal part of the retaining cables (18) and (27) and install the new AIPC 21-52-41-28-070 WASHER (14) and the new AIPC 21-52-41-28-060 NUT (13).

NOTE: The retaining cables (18) and (27) will twist, if you do not hold the hexagonal part of the retaining cables (18) and (27).

(25) Hold the hexagonal part of the retaining cables (18) and (27).
(26) Torque the nuts (13) to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in )

NOTE: The retaining cables (18) and (27) will twist, if you do not hold the hexagonal part of the retaining cables (18) and (27).

(27) Clean the unwanted grease from the retaining cables (18) and (27).

CAUTION: MAKE SURE THAT THE BONDING STRAP(S) IS(ARE) CONNECTED BEFORE YOU CONNECT THE ELECTRICAL WIRE(S).

(28) If applicable, connect the bonding strap (30) to the reheater (12):

NOTE: The bonding strap (30) is only applicable for the pack-air conditioning system with the anti-ice valve.

(a) For the reheater (12) with the bonding tab:

Put the bonding strap (30) in position and install the screw (19), the washer (34) and the nut (31) (Ref. AMM TASK 20-28-00-912-802).
Tighten the nut (31).

(b) For the reheater (12) with the riveted nut:

Put the bonding strap (30) in position and install the washer (34) and the screw (19) (Ref. AMM TASK 20-28-00-912-802).

(29) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(30) Connect the electrical connector (25):

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Connect the electrical connector (25).
(31) Install the water extractor(s) (Ref. AMM TASK 21-52-16-400-001) :

NOTE: Do not install the access panel(s) at this time.

(a) FOR [10HM3] (REHEATER)

10HM8.

(b) FOR [11HM3] (REHEATER)

11HM8.

(32) Install the applicable pipe assembly (Ref. AMM TASK 21-52-23-400-003) :

NOTE: Do not install the access panel(s) at this time.

(a) FOR [10HM3] (REHEATER)

10HM.

(b) FOR [11HM3] (REHEATER)

11HM.

(33) Make sure that the work area is clean and clear of tools and other items.

Subtask 21-52-31-420-051-D ** ON A/C NOT FOR ALL

C. Installation of the Reheater

Reheater ** ON A/C NOT FOR ALL

NOTE: Turn the sleeves (17) and (26) when you move them or install them. This will help to prevent damage to the internal seals or packings.

(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Clean the component interfaces and the adjacent area.
(3) Remove the PLUG-BLANKING from each disconnected line end.
(4) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
(5) To prevent damage to the internal seals or packings, turn the sleeves (17) and (26) when you move or install them.
(6) Put the new AIPC 21-52-41-26-180 SEAL (28) in position in the sleeve (26) (Ref. AMM TASK 20-26-00-910-002) .
(7) Put the new AIPC 21-52-41-28-050 SEAL (16) in position in the sleeve (17) (Ref. AMM TASK 20-26-00-910-002) .
(8) Apply lubricant:

CAUTION: USE ONLY THE SPECIFIED LUBRICANT TO LUBRICATE THE O-RINGS AND THE PACKINGS. OTHER LUBRICANTS CAN CAUSE SMOKE OR A SMELL IN THE CABIN WHEN THEY BECOME HOT.

(a) Apply the lubricant as follows:

Dry lubricant-General Assembly Molybdenum Disulfide - (Material No.03QBB9) is a powder. It is applied as a paste. To make a paste, mix the molybdenum disulfide powder with the pure water or the white spirit.
Apply a small quantity of Dry lubricant-General Assembly Molybdenum Disulfide - (Material No.03QBB9) or Dry lubricant-General Assembly Graphite - (Material No.03QBD1) to a new AIPC 21-52-41-28-020 PACKING (23).

NOTE: Dry lubricant-General Assembly Graphite - (Material No.03QBD1) is applied dry.

(9) Put the packing (23) in position on the ACM turbine inlet (24).
(10) Carefully put the reheater (12) in position in the sleeve (26) and on the ACM turbine inlet (24). Turn the sleeve (26) when you install the reheater (12) to prevent damage to the seal (28).
(11) Hold the reheater (12) and put the support rods (77) and (81) in position in the clevis (3).
(12) Install the bushings (6), bolts (7), washers (5) and nuts (4).
(13) Tighten the nuts (4).
(14) Put the clamp (22) in position.
(15) TORQUE the clamp to between 0.55 and 0.5 m.daN (48.67 and 44.25 lbf.in )

NOTE: Correct position of the clamp is between the end and first flange of the pipe assembly.

NOTE: The retaining cables (18) and (27) will twist, if you do not hold the hexagonal part of the retaining cables (18) and (27).

(25) Hold the hexagonal part of the retaining cables (18) and (27).
(26) Torque the nuts (13) to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in )

NOTE: The retaining cables (18) and (27) will twist, if you do not hold the hexagonal part of the retaining cables (18) and (27).

(27) Clean the unwanted grease from the retaining cables (18) and (27).

CAUTION: MAKE SURE THAT THE BONDING STRAP(S) IS(ARE) CONNECTED BEFORE YOU CONNECT THE ELECTRICAL WIRE(S).

(28) If applicable, connect the bonding strap (30) to the reheater (12):

NOTE: The bonding strap (30) is only applicable for the pack-air conditioning system with the anti-ice valve.

(a) For the reheater (12) with the bonding tab:

Put the bonding strap (30) in position and install the screw (19), the washer (34) and the nut (31) (Ref. AMM TASK 20-28-00-912-802).
Tighten the nut (31).

(b) For the reheater (12) with the riveted nut:

Put the bonding strap (30) in position and install the washer (34) and the screw (19) (Ref. AMM TASK 20-28-00-912-802).

(29) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(30) Connect the electrical connector (25):

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Connect the electrical connector (25).
(31) Install the water extractor(s) (Ref. AMM TASK 21-52-16-400-001) .

NOTE: Do not install the access panel(s) at this time.

(a) FOR [10HM3] (REHEATER)

10HM8.

(b) FOR [11HM3] (REHEATER)

11HM8.

(32) Make sure that the work area is clean and clear of tools and other items.

Subtask 21-52-31-865-054-A

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
FOR FIN: 10HM3 (REHEATER)
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** ON A/C NOT FOR ALL
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP/CTL SYS1/1/28VDC	3HH	X21
122VU	AIR COND/PACK TEMP CTL SYS2/1/28VDC	4HH	Y19
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18
** ON A/C NOT FOR ALL
FOR FIN: 11HM3 (REHEATER)
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20

Subtask 21-52-31-710-050-A

E. Test(s)
(1) Do the pre-conditioning through the HP ground connector (Ref. AMM TASK 12-33-21-618-001) or with the APU (Ref. AMM TASK 12-33-21-618-001).
(2) Do a leak check of the reheater connections.

NOTE: Minimum leakage is permitted. After the pack operates some minutes, the leakage of air will decrease because the seals have their correct operating temperature.

(3) After approximately 15 minutes stop the pre-conditioning (Ref. AMM TASK 12-33-21-618-001) or (Ref. AMM TASK 12-33-21-618-001).
(4) Do the operational test of the cockpit and cabin temperature control (Ref. AMM TASK 21-63-00-710-004).

5. Close-up
Subtask 21-52-31-410-052-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panels on the belly fairing structure (Ref. AMM TASK 53-35-13-400-002):
(a) FOR [10HM3] (REHEATER)

191KB.

(b) FOR [11HM3] (REHEATER)

192KB.

(3) Remove the WARNING NOTICE(S).

Subtask 21-52-31-862-050-A

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

[Rev.10 from 2021] 2026.04.02 06:47:32 UTC