S 865-138
(5)
Stop for one minute and read airspeed again.
S 865-139
(6)
Make sure that the airspeed does not decrease by more than 5.0 knots
(0.16 in. Hg).
S 865-140
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 to Its Usual Condition
S 085-131
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.
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(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
_______ 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.
(c)
Examine the drain hole for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-11/601).
S 865-147
(3)
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 865-148
(4)
Close the FLAP LOAD RELIEF circuit breaker on the load control panel P6.
S 865-149
(5)
Remove electrical power if it is not necessary (Ref 24-22-00/201).
TASK 34-11-00-865-150
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 865-151
(1) Supply electrical power (Ref 24-22-00/201).
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CAUTION: YOU MUST OPEN THE DIGITAL STALL WARNING COMPUTER (DSWC) CIRCUIT
_______ BREAKERS. YOU CAN CAUSE THE DSWC TO FAIL THE SELF-TEST UNTIL IT IS SET AGAIN.
(2) Open the STALL WARNING NO. 1 and NO. 2 circuit breakers on load control panels P6 and P18.
S 485-336
WARNING: WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT CONDITION IS
_______ VISIBLE FROM THE GROUND. FAILURE TO OBSERVE AND REMOVE COVERINGS OVER STATIC PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN AIRSPEED SENSING AND ALTITUDE SENSING SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
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