S 865-057
(3)
Stop for 5 to 6 minutes to permit the system to become stable.
S 865-058
(4)
Write the airspeed.
S 865-059
(5)
Stop for one minute and read the airspeed again.
S 865-060
(6)
Make sure that the airspeed does not decrease by more than 5.0 knots
(0.16 in. Hg).
S 865-061
CAUTION: TO PREVENT EQUIPMENT DAMAGE, THE PITOT LINE PRESSURE MUST
_______ ALWAYS EQUAL OR EXCEED STATIC LINE PRESSURE. KEEP RATE OF PITOT PRESSURE CHANGE LESS THAN 300 KNOTS FOR EACH MINUTE. KEEP THE DIFFERENTIAL PRESSURE BETWEEN 0 AND 10.00 INCHES OF MERCURY.
(7) Open the pitot cutoff valve and send the captain's pitot system to ambient pressure.
NOTE: You must release the vacuum from the cutoff valves slowly.
____
E. Put the Airplane to Its Usual Condition
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A 737-300/400/500MAINTENANCE MANUAL
S 085-312
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.
S 085-067
(2)
Remove the pitot-static probe adapter from the upper 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
_______ THE PITOT-STATIC PROBE. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS ON THE PITOT-STATIC PROBE.
(b) Remove the vinyl adhesive tape from the probe pitot chamber drain hole.
S 205-068
(3)
Examine the pitot-static probe for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-11/601).
S 215-069
(4)
Make sure that the pitot-static probe does not show damage to the pitot tip or the static ports (Ref 34-11-11/601).
S 865-070
(5)
Close the STALL WARNING NO. 1 and NO. 2 circuit breakers on load control panels P6 and P18.
(6)
Remove electrical power if it is not necessary (Ref 24-22-00/201).
S 865-072
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A
737-300/400/500MAINTENANCE MANUAL
TASK 34-11-00-865-073
4. The First Officer's Pitot System Leak Test
__________________________________________
A. Standard Tools and Equipment
(1)
Air data test set, Castleberry AT700-2, Castleberry Instr & Avionics, Austin, TX; or equivalent
(2)
Pitot-static probe adapter kit, P/N AD-953-7, Nav-Aids Ltd., Montreal, Canada; or equivalent
(3)
Flow restrictors, control valves, cutoff valves, vinyl adhesive tape, and port seals 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 865-074
(1) Supply the electrical power (Ref 24-22-00/201).
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