S 485-032
WARNING:_______MAKE SURE THAT THE PROBE HEAT IS NOT ON. YOU CAN CAUSE INJURY TO PERSONS.
(2) Install the pitot-static probe adapter on the upper right
pitot-static probe.
CAUTION:_______DO NOT EXTEND THE SEALS INTO THE PITOT DRAINS. YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
(a) Seal the pitot chamber drain hole on the bottom of the probe with vinyl adhesive tape.
NOTE: You will find the drain hole, approximately 2.25 inches,
____
aft of the probe tip.
CAUTION: MAKE SURE THAT YOU FLUSH THE PROBE ADAPTER WITH WATER
_______ BEFORE YOU ATTACH THE ADAPTER TO THE PROBE. YOU CAN CAUSE DAMAGE TO THE PROBE OR THE ADAPTER.
(b)
Flush the probe adapter with water. NOTE: Use equal parts of water and ethylene glycol when the
(c)
Install the probe adapter on the probe.
____ temperature is between 32 degrees F and -40 degrees F.
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747-400 MAINTENANCE MANUAL
S 485-033
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.
(3) Connect the pneumatic test set to the pitot-static probe adapter.
(a)
Connect the pitot (pressure) source in the pneumatic test unit through the pitot control valve to the pitot cutoff valve.
(b)
Connect the pitot inlet of the probe adapter to the pitot cutoff valve through the test gage and flow restrictor.
(c)
Open the pitot cutoff valve.
S 795-034
(4) Do a leak test of the first officer's pitot system.
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
10.19 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
(a) Apply pressure to the first officer's pitot system equivalent to 300 |5 knots of airspeed (ambient pressure plus 4.53 |0.16 in. Hg).
CAUTION: MAKE SURE THAT YOU HOLD THE PRESSURE BEHIND THE CUTOFF
_______ VALVE DURING THE CUTOFF TIME. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT WHEN YOU OPEN THE CUTOFF VALVE WITHOUT THE PRESSURE.
(b)
Close the pitot cutoff valve to the system when the instrument shows the necessary airspeed.
(c)
Stop for 5 to 6 minutes to permit the system to become stable.
(d)
Write the airspeed.
(e)
Stop for 1 minute and read the airspeed again.
(f)
Make sure that the airspeed does not go down by more than 5.0 knots (0.16 in. Hg).
S 865-035
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 10.19 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
(5) Open the pitot cutoff valve.
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747-400
MAINTENANCE MANUAL
S 865-266
(6) Put the first officer's pitot system to ambient pressure.
NOTE: You must release the vacuum from the cutoff valves slowly.
____
S 085-036
CAUTION: MAKE SURE THAT THE PITOT-STATIC PROBE HAS NO ADDED WEIGHT FROM
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