34-11-01
ú ú 03 Page 520 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 865-162
(3)
Stop for 5 to 6 minutes to allow the system to stabilize.
S 865-163
(4)
Write the airspeed.
S 865-164
(5)
Stop for one minute and read the airspeed again.
S 865-165
(6)
Make sure that the airspeed does not decrease by more than 5.0 knots
(0.16 in. Hg).
S 865-166
CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR MORE
_______ THAN THE STATIC LINE PRESSURE. KEEP THE PITOT PRESSURE CHANGE BELOW 300 KNOTS FOR EACH MINUTE. MAKE SURE THAT THE DIFFERENTIAL PRESSURE STAYS BETWEEN 0 AND 10.00 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
(7) Open the pitot cutoff valve and send the auxiliary No. 2 pitot system to ambient condition.
NOTE: You must release the pressure from the cutoff valves slowly.
____
E. Put the Airplane Back to Its Usual Condition
S 085-360
CAUTION: MAKE SURE THAT THE PITOT-STATIC PROBE HAS NO ADDED WEIGHT FROM
_______ THE TEST HOSES. YOU CAN BEND OR TWIST THE PITOT-STATIC PROBE OUT OF TOLERANCE.
CAUTION: DO NOT DISCONNECT THE PNEUMATIC TEST SET WHEN THE PITOT-STATIC
_______ SYSTEM IS NOT AT AMBIENT PRESSURE. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
(1) Disconnect the pneumatic test set from the pitot-static probe adapter.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
34-11-01
ú ú 03 Page 521 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 085-361
(2) Remove the pitot-static probe adapter from the lower left pitot-static probe.
(a) Remove the probe adapter from the probe.
NOTE: Dry off the pitot-static probe probes with a soft rag
____ when you use ethylene glycol.
CAUTION: MAKE SURE THAT YOU REMOVE ALL OF THE PIECES OF TAPE FROM
_______ EACH PITOT-STATIC PROBE. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSITION.
(b)
Remove the vinyl adhesive tape from the probe pitot chamber drain hole.
(c)
Examine the drain hole for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-11/601).
S 845-173
(3)
Make sure that the pitot-static probes do not show damage to the pitot tip or the static ports (Ref 34-11-11/601).
S 845-174
(4)
Close the FLAP LOAD RELIEF circuit breaker on the load control panel P6.
S 865-362
(5)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 34-11-01-795-176
7. The Captain's Static System Low-Range Leak Test
_______________________________________________
A. Standard Tools and Equipment
(1)
Air data test set, Castleberry AT700-2, Castleberry Instr & Avionics, Austin, TX; or equivalent
(2)
Flow restrictors, control valves, cutoff valves, and vinyl adhesive tape as required
B. References
(1)
24-22-00/201, Manual Control
(2)
34-11-11/601, Pitot-Static Probe
C. Prepare for the Test
S 865-363
(1) Supply electrical power (AMM 24-22-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
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