D. Pitot-Static Probe Internal Cleaning - On the airplane
S 867-020
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6D30 PROBE HEAT PITOT L
2) 6D31 PROBE HEAT PITOT R
3) 6D32 PROBE HEAT AUX PITOT L
4) 6D33 PROBE HEAT AUX PITOT R
S 217-003
WARNING:_______MAKE SURE THE PROBE HEAT IS NOT ON. THIS CAN CAUSE INJURY TO PERSONS.
CAUTION:_______DO NOT PUT OBJECTS INTO THE STATIC PORTS. THIS CAN CAUSE DAMAGE TO THE PITOT-STATIC PROBE.
(2) Do the pitot-static probe inspection (Ref 34-11-01/601).
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34-11-01
ALL ú ú 01 Page 701 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 037-004
(3)
Disconnect the pitot-static system hoses from the probe. S 167-005
CAUTION:_______DO NOT USE MORE THAN 60 PSI OF AIR PRESSURE. THIS CAN CAUSE DAMAGE TO THE PROBE.
(4)
Blow compressed dry air into the line fittings of the probe.
(a)
Make sure the air comes out of the pitot opening.
(b)
Make sure the air comes out of the static ports.
S 437-006
(5)
Connect the pitot-static hoses to the probe.
S 437-007
(6)
Tighten the line fittings to these values:
(a)
Pitot (P) pressure line 140 |4 pound-inches
(b)
Static (S1) pressure line 190 |10 pound-inches
(c)
Static (S2) pressure line 270 |14 pound-inches
S 867-008
(7) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P6 Main Power Distribution Panel
1) 6D30 PROBE HEAT PITOT L
2) 6D31 PROBE HEAT PITOT R
3) 6D32 PROBE HEAT AUX PITOT L
4) 6D33 PROBE HEAT AUX PITOT R
E. Pitot-Static Probe Internal Cleaning - Off the airplane
S 027-009
(1)
Remove the pitot-static probe from the airplane (Ref 34-11-01/401).
S 177-010
(2)
Soak or flush the pitot-static probe with clean water.
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34-11-01
ALL ú ú 01 Page 702 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 177-025
(3) Drain the water from the pitot-static probe.
S 167-026
CAUTION:_______DO NOT USE MORE THAN 60 PSI OF AIR PRESSURE. THIS CAN CAUSE DAMAGE TO THE PROBE.
(4) Blow compressed dry air into the line fittings of the probe.
(a)
Make sure the air comes out of the pitot opening.
(b)
Make sure the air comes out of the static ports.
S 147-027
(5)
Clean the drain hole of the pitot-static probe.
S 147-028
(6)
If the drain hole is not clean:
(a)
First, put a 0.029 inch drill rod into the drain hole.
(b)
Second, put a 0.033 inch drill rod into the drain hole.
NOTE: The diameter of the drain hole must be less than 0.033
____
+0.002/-0.001 inches.
S 427-014
(7) Install the pitot-static probe on the airplane (Ref 34-11-01/401).
TASK 34-11-01-107-015
3. External Cleaning of the Pitot-Static Probe
___________________________________________
A. Access
(1) Location Zone
113 Nose Gear Well, LH
211 Passenger Cabin Nose to First Door, LH
114 Nose Gear Well, RH
212 Passenger Cabin Nose to First Door, RH
B. Procedure
S 867-016
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
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