34-11-00
ALL ú ú 18 Page 8 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
LOWER RIGHT PITOT-UPPER RIGHT PITOT-
RIGHT ALTERNATE RIGHT DEDICATED
STATIC PROBE STATIC PROBE
PT S1S2PT S1S2 STATIC PRESSURE PORT STATIC PRESSURE PORT
AUX NO. 2 PITOT
A
747-400
MAINTENANCE MANUAL
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34-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F/O STATIC
F/O PITOT
V631
SOURCE
SELECT
VALVE
B164
R-ADC
E2-2 MN
EQPT CTR
B166
C-ADC
ALTERNATE STATIC
STA 2380 PRESSURE BULKHEAD
B169
ELEVATOR
FEEL
S110COMPUTER
ALT SW
NOSE
DOOR
LATCH
STA 2480
W/L 315
BL 0 B163 STANDBY L-ADC
AIRSPEED
IND
STATICE1-2 MN
N246 DRAIN
EQPT CTR
ALTERNATE STATIC
STATIC STANDBY PRESSUREALTIMETER LINE
CAPT STATIC
PITOT
DRAIN
N141
CAPT PITOTCTR INSTR PNL (P2) PITOTPRESSUREAUX NO. 2 PITOT LINE AUX NO. 1 PITOT AUX NO. 1 PITOT
PT S1S2PT S1S2LEFT ALTERNATE LEFT DEDICATEDLOWER LEFT PITOT-UPPER LEFT PITOT-
STATIC PRESSURE PORT STATIC PRESSURE PORTSTATIC PROBE STATIC PROBE
Pitot-Static System Schematic
Figure 2
D23223
A
747-400
MAINTENANCE MANUAL
B. Control
(1) Each of the pitot-static subsystems is always open to the atmosphere so there is no on or off mode of operation. Should it become necessary to subject any one of the subsystems to operational conditions, refer to 34-11-00, Maintenance Practices.
CAUTION: PITOT-STATIC PROBES ARE DELICATE INSTRUMENTS AND CRITICALLY
_______ ALIGNED ON THE AIRPLANE. EXTREME CARE MUST BE EXERCISED WHEN INSTALLING, REMOVING OR HANDLING. DO NOTHING THAT PLACES ADDED WEIGHT OR STRAIN ON PROBE.
(2) A protective cover is made for use on each pitot-static probe during airplane storage and maintenance (tool number HTC-74/76-PP). It is a slip-on cover with an attached warning streamer. Cover removal or installation is performed with the aid of tool ME65B40136-1.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
PITOT-STATIC SYSTEM
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE AMM
ALTIMETER - (AMM 34-13-00/101)
STANDBY, N141
COMPUTER - (AMM 27-31-00/101)
ELEVATOR FEEL, B169
COMPUTER - (AMM 34-12-00/101)
C AIR DATA, B166
L AIR DATA, B163
R AIR DATA, B164
INDICATOR - (AMM 34-13-00/101)
STANDBY AIRSPEED, N246
PORT - ALTERNATE STATIC PRESSURE -- 2 FUSELAGE, STA 465, WL 140 34-11-02
PORT - DEDICATED STATIC PRESSURE -- 2 FUSELAGE, STA 2367, WL 243 34-11-02
PROBE - LOWER LEFT PITOT-STATIC, A1 -- 1 FORWARD FUSELAGE LEFT SIDE, 34-11-01
STA 270, WL 190
PROBE - LOWER RIGHT PITOT-STATIC, A3 -- 1 FORWARD FUSELAGE RIGHT SIDE, 34-11-01
STA 270, WL 190
PROBE - UPPER LEFT PITOT-STATIC, A2 -- 1 FORWARD FUSELAGE LEFT SIDE, 34-11-01
STA 270, WL 207
PROBE - UPPER RIGHT PITOT-STATIC, A4 -- 1 FORWARD FUSELAGE RIGHT SIDE, 34-11-01
STA 270, WL 207
VALVE - PITOT-STATIC SOURCE SELECT, V631 -- 1 AFT SIDE OF FLOOR BEAM, STA 440 34-11-03
Pitot-Static System - Component Index
Figure 101
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34-11-00
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E29036
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