B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
External Power 25-54-12-000-001 Removal of the FWD Cargo Compartment Partition FR34 52-30-00-860-001 Open the FWD or AFT Cargo-Compartment Door with the
Yellow Electric Pump
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
21-21-43-991-001 Fig. 401 R **ON A/C 106-149, 303-399, 401-499,
21-21-43-991-001-A Fig. 401A
**ON A/C ALL
3. Job Set-up__________
Subtask 21-21-43-860-050
A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002)
Subtask 21-21-43-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
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/FLOW/MIXER/FLAP 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS2 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS1 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS2 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS1 3HB 4HK 3HK 2HK 1HK V22V20V19V18V17
**ON A/C ALL
122VU AIR COND/RECIRC FAN/R/CTL 122VU AIR COND/RECIRC FAN/R/SPLY 122VU AIR COND/RECIRC FAN/L/CTL 122VU AIR COND/RECIRC FAN/L/SPLY 11HG 3HG 2HG 1HG W20W18X20X18
R **ON A/C 401-499,
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 1/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/28VDC 53HH 55HH 49HH 51HH 56HH W22W21X22X21 Y21
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU AIR COND/TEMP CTL SYS 2/CHAN B/115VAC 54HH Y20 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC 50HH Y18
R
**ON A/C ALL
Subtask 21-21-43-941-051
C. 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 and the LP ground connectors:
(a) Put a warning notice in position to tell persons not to supply the ground air.
Subtask 21-21-43-010-050
D. Get Access
(1)
Open the FWD cargo-compartment door 825 (Ref. TASK 52-30-00-860-001).
(2)
Put the access platform in position at the FWD cargo-compartment door
825.
(3)
Remove the access panels 131PW, 131NW and 132PW (Ref. TASK 25-54-12-000-001).
4. Procedure
_________
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 401/TASK 21-21-43-991-001) R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 401A/TASK 21-21-43-991-001-A)
**ON A/C ALL
Subtask 21-21-43-020-050
A. Removal of the Mixer Unit
(1)
Disconnect the electrical connectors (8), (14) and (15).
(2)
Put blanking caps on the disconnected electrical connectors.
(3)
Remove the clamp (10) and disconnect the sleeve (9).
(4)
Remove and discard the cable-ties (40) and remove the insulation (6) and (7).
(5)
Remove the clamps (53).
(6)
Move the sleeves (54) downwards and onto the flanges (55) and (56).
(7)
Remove the clamps (21) and disconnect the sleeves (20).
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