R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
21-52-24-991-001 Fig. 401
-------------------------------------------------------------------------------
REFERENCE DESIGNATION -------------------------------------------------------------------------------
R **ON A/C 151-199, 401-499,
R R 21-52-24-991-001-A Fig. 401A
**ON A/C ALL
21-52-24-991-003 3. Job Set-up__________ Subtask 21-52-24-861-051 Fig. 402
A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-52-24-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 10HM4
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
R 122VU AIR COND/PACK TEMP/CTL SYS1/1/115VAC 122VU AIR COND/PACK TEMP/CTL SYS1/1/28VDC 1HH 3HH X22X21
R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
R R 122VU AIR COND/PACK TEMP CTL SYS2/1/28VDC **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399, 4HH Y19
R 122VU AIR COND/PACK TEMP CTL SYS2/1/115VAC 2HH Y18
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION
-------------------------------------------------------------------------------
R **ON A/C 106-149, 303-399,
R 122VU 4HH Y19
R **ON A/C 401-499,
R R R R 122VU AIR COND/TEMP CTL SYS 2/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 2/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/115VAC 53HH 55HH 56HH 54HH W22 W21 Y21 Y20
**ON A/C ALL
FOR 11HM4
R **ON A/C 401-499,
49VU AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC 52HH D08
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
122VU AIR COND/PACK TEMP/CTL SYS1/2/115VAC 122VU AIR COND/PACK TEMP/CTL SYS1/2/28VDC 122VU AIR COND/PACK TEMP CTL SYS2/2/28VDC 122VU AIR COND/PACK TEMP CTL SYS2/2/115VAC 21HH 23HH 24HH 22HH W22W21Y21Y20
R **ON A/C 401-499,
122VU AIR COND/TEMP CTL SYS 1/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC 49HH 51HH 50HH X22X21Y18
**ON A/C ALL
Subtask 21-52-24-010-051
C. Get Access
(1)
Remove the access panel (Ref. TASK 53-35-13-000-002). FOR 10HM4 191KB, FOR 11HM4 192KB.
(2)
Remove the ram air outlet (Ref. TASK 21-61-52-000-003).
(3) Remove the pipe assembly (Ref. TASK 21-52-23-000-001).
Subtask 21-52-24-941-052
D. Safety Precautions
(1)
On the panel 30VU:
(a)
Make sure that:
-
the APU BLEED pushbutton switch is in the off position (the ON legend is off) and,
-
the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
(b)
Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2)
On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.
4. Procedure
_________
Subtask 21-52-24-020-051
A. Removal of the Heat Exchanger Unit R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
(Ref. Fig. 401/TASK 21-52-24-991-001)R **ON A/C 151-199, 401-499,
R (Ref. Fig. 401A/TASK 21-52-24-991-001-A) R
**ON A/C ALL
(1)
Remove the clamp (5) and disconnect the bellows (6).
(2)
Remove the clamp (12) and disconnect the sleeve (13).
(3)
Remove the clamp (14) and move the duct (15) and the sleeve (16) to the heat exchanger unit (7).
(4)
Remove the clamp (2) and move the sleeve (3) away from the heat exchanger unit (7).
(5)
Remove the nut (33), the washer (32), the screw (31) and disconnect the bonding straps (34) (when installed) and (41).
(6)
Remove and discard the nuts (74) and the washers (73) from the retaining cables (75), (90) and (96).
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