S 622-039
(3)
Cover each vent opening with cheesecloth using 3M tape 481 and attach red flags to each installation.
NOTE: Put covers on each vent opening with cheesecloth to make
____ sure insects do not go into the vents.
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747-400 MAINTENANCE MANUAL
J. Hydraulic System Deactivation (Storage up to 60 days)
S 212-040
(1)
Do a check of the hydraulic system for leaks and make repairs it it is necessary.
S 612-041
(2)
Fill the systems and the reservoirs with hydraulic fluid
(AMM 12-12-01/301).
S 642-042
(3)
Lubricate all the hydraulic components which have lubrication fittings (AMM 12-21-00/001, AMM 12-21-01/301, AMM 12-21-16/301, AMM 12-21-17/301, AMM 12-21-18/301, AMM 12-21-19/301, AMM 12-21-20/301, AMM 12-21-21/301, and AMM 12-21-22/301).
S 862-043
(4)
Service the hydraulic reservoirs and accumulators before each engine run (AMM 12-15-09/301).
S 682-208
(5)
If the engines are removed from the airplane, remove the pressure in the hydraulic reservoirs and accumulators.
S 842-044
(6)
Pressurize to 40 psi with dry nitrogen (AMM 12-15-09/301).
S 612-045
(7)
Fill the hydraulic pump gearbox pneumatic drive with oil
(AMM 12-13-09/301).
S 622-046
(8)
Put a cover on the turbine exhaust port of the hydraulic pump.
K. Instruments Deactivation
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747-400 MAINTENANCE MANUAL
S 422-262
WARNING:_______ WHEN THE PITOT PROBES ARE COVERED, MAKE SURE THAT CONDITION IS
VISIBLE FROM THE GROUND. IN ADDITION, ATTACH A TAG TO THE LEFT
CONTROL IN THE FLIGT DECK AS A REMINDER THAT PITOT PROBES ARE
COVERED. FAILURE TO OBSERVE AND REMOVE COVERINGS OVER PITOT
PROBES BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN AIRSPEED-SENSING
AND ALTITUDE-SENSING SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE
FLIGHT.
CAUTION: MAKE SURE THE PITOT-STATIC PROBE COVERS ARE IN GOOD WORKING
_______ CONDITION WITH NO EVIDENCE OF DAMAGE, ESPECIALLY FRAYING AROUND THE COVER OPENING. FRAYED FIBERS FROM THE COVER COMBINED WITH OTHER SUBSTANCES SUCH AS DIRT, GREASE AND FLUIDS CAN CAUSE OBSTRUCTON IN THE PROBE.
CAUTION: WHENEVER AN OPENING IS COVERED, MAKE SURE THAT CONDITION IS
_______ VISILBLE FROM THE GROUND. ENGINES SHOULD NOT BE OPERATED WITH COVERS IN PLACE BECAUSE THE COVERS CAN COME OFF AND DAMAGE THE ENGINES.
(1)
Install pitot-static probe covers (4 places).
S 622-055
(2)
Attach the pitot-static probe streamers to prevent abrasion damage to the skin and the painted surface.
S 422-263
(3)
Attach a red paper tag that has "PITOT PROBES COVERED" printed on it in black letters, to the top of the left control wheel in the flight deck.
S 422-264
WARNING: WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT CONDITION IS
_______ VISIBLE FROM THE GROUND. IN ADDITION, ATTACH A TAG TO THE LEFT CONTROL WHEEL IN THE FLIGHT DECK AS A REMINDER THAT STATIC PORTS ARE COVERED. 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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