(d)
Measure the distance from the forward end of the valve actuator body to the centerline of the actuator rod end bearing.
(e)
Make sure that the measurement is 3.55 (|0.15) inches.
(f)
Do the five steps just before this step again if the measurement is not in the limits of the tolerance.
S 434-030
(4)
Install a lockwire to the jamnuts (Ref 20-11-28/401).
S 434-031
(5)
Connect the wires to the terminals 1 and 3 on the limit switch.
S 434-048
(6)
Apply a layer of sealant, BMS5-95, to the mating surfaces of the wires and the limit switch.
G. Functional Check of the Ram Air Exit Door Limit Switch
S 864-033
(1) Open these circuit breakers on P6 Main Power Distribution panel and attach DO-NOT-CLOSE tags:
(a)
6F35 PACK TEMP CONT A
(b)
6F36 PACK TEMP CONT B
S 024-034
(2) Disconnect the electrical connector from the actuator of the ram air exit door for the applicable pack (1, 2 or 3):
(a) DV156 for pack 1
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747-400 MAINTENANCE MANUAL
(b) DV157 for pack 2
(c) DV158 for pack 3.
S 424-035
(3) Install short, low resistance, jumper wires from pins 1, 2 and 3 on
the electrical connector (DV156, DV157, DV158) to pins 1, 2 and 3 on
the actuator (V156, V157, V158), respectively.
(a) DV156 and V156 for pack 1
(b) DV157 and V157 for pack 2
(c) DV158 and V158 for pack 3
S 864-036
(4) Close this circuit breaker on the P6 Main Power Distribution panel:
NOTE: After you close the circuit breaker listed below, CMC____
messages will show and report the ram air exit door
actuator(s) as failed. However, the CMC messages will clear
after completion of this functional check and restoration of
the airplane.
(a) 6F35 PACK TEMP CONT A
S 864-037
(5) Make sure on the EICAS ECS maintenance page that PTC CHANNEL IN CONT
shows "A" for each pack, and an RAE POSITION indication shows for
each pack ram air exit door.
S 864-042
(6) Close the ram air exit door manually with the Allen wrench until
there is continuity between the terminals 1 and 3 of the limit
switch.
S 864-040
(7) Make sure the RAE POSITION indication shows 0.85+/-0.03 on the EICAS
ECS maintenance page.
(a) If the RAE POSITION indication does not show 0.85+/-0.03, do
the above steps to adjust the limit switch.
S 864-045
(8) Open this circuit breaker on P6 Main Power Distribution panel and
attach DO-NOT-CLOSE tag:
(a) 6F35 PACK TEMP CONT A
S 024-043
(9) Remove the jumper wires from the electrical connector and the
actuator.
S 424-044
(10) Connect the electrical connector to the actuator of the ram air exit door for the applicable pack (1, 2 or 3):
(a) DV156 for pack 1
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747-400 MAINTENANCE MANUAL
(b)
DV157 for pack 2
(c)
DV158 for pack 3.
H. Put the Airplane Back to Its Usual Condition
S 864-024
(1) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P415 Power Distribution Center - Right
1) 415C38 PACK TEMP CONT B
2) 415K27 PACK TEMP CONT A
(b)
P180 DC Power Distribution Panel
1) 180J2 PACK 1 PROT
2) 180F2 PACK 2 PROT
3) 180J17 PACK 3 PROT
(c)
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