B. Procedure
S 864-002
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6L1 FLT DECK LIGHT STBY INST
2) 6E19 FLT DK LIGHTS PANEL CAPT
S 024-003
(2) Remove the standby airspeed indicator:
(a) Loosen the two adjustment screws adjacent to the indicator (see Figure 401).
CAUTION: CAREFULLY PULL THE INDICATOR FROM THE INSTRUMENT PANEL.
_______ TOO MUCH FORCE CAN CAUSE DAMAGE TO THE ELECTRICAL CABLE AND THE HOSES ON THE REAR OF THE INDICATOR.
(b) Pull the indicator out of the instrument panel until you can get to the electrical connector and the hoses.
CAUTION: DO NOT DISCONNECT THE PITOT-STATIC SYSTEM HOSES WHEN THE
_______ SYSTEM IS NOT AT AMBIENT PRESSURE. THIS CAN CAUSE DAMAGE TO THE STANDBY AIRSPEED INDICATOR.
(c)
Disconnect the pitot-static system hoses from the indicator.
(d)
Disconnect the electrical connector from the indicator.
(e)
Install dust caps on the electrical connectors.
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A
747-400
MAINTENANCE MANUAL
Standby Airspeed Indicator - Installation
Figure 401
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A
747-400 MAINTENANCE MANUAL
TASK 34-13-01-424-014
3. Standby Airspeed Indicator Installation
_______________________________________
A. General
(1) You do not have to do a leak test when you connect a quick-disconnect fitting. A visual examination of the quick-disconnect for a complete seal is necessary. You must do a leak test when you cannot make sure that the quick-disconnect has a complete seal.
B. References
(1)
24-22-00/201, Manual Control
(2)
IPC 34-13-02 Fig. 1
C. Access
(1) Location Zone
221 Control Cabin, LH
D. Procedure
S 864-005
(1) Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
(a) P6 Main Power Distribution Panel
1) 6L1 FLT DECK LIGHT STBY INST
2) 6E19 FLT DK LIGHTS PANEL CAPT
S 424-006
(2) Install the standby airspeed indicator:
(a)
Remove the dust caps from the electrical connectors.
(b)
Examine the electrical connectors for loose, bent, or broken pins.
CAUTION: DO NOT CONNECT THE PITOT-STATIC SYSTEM HOSES WHEN THE
_______ SYSTEM IS NOT AT AMBIENT PRESSURE. THIS CAN CAUSE DAMAGE TO THE STANDBY AIRSPEED INDICATOR.
(c)
Connect the pitot-static system hoses to the indicator.
(d)
Make sure the pitot-static system hose connections are locked in the sealed position.
(e)
Connect the electrical connector to the indicator.
CAUTION: CAREFULLY PUT THE INDICATOR INTO THE INSTRUMENT PANEL.
_______ TOO MUCH FORCE CAN CAUSE DAMAGE TO THE ELECTRICAL CABLE AND THE HOSES ON THE REAR OF THE INDICATOR.
(f)
Put the indicator into the instrument panel.
(g)
Tighten the two adjustment screws adjacent to the indicator.
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