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May 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-11-0 Page 507
F. Restore Airplane to Normal Configuration
WARNING: Failure to remove the vinyl adhesive tape from the static ports before flight may cause large errors in airspeed sensing and altitude sensing signals which may lead to loss of safe flight.
(1)
Remove all seals and adapters from all pitot static probes that were tested. Check that no deposits or roughness exists in or about static ports or pitot head apertures.
(2)
Remove flush to body mounted adapter from alternate static port and seal if system was tested.
(3)
Remove all pitot pressure chamber drain seals.
(4)
Replace all drain fitting caps.
(5)
Ensure that flight recorder (if installed) is returned to normal operating configuration.
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34-11-0 Page 508 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/98
PITOT STATIC PROBE - REMOVAL/INSTALLATION
1. General
A. The removal/installation of all pitot tubes is similar.
2. Equipment and Materials
A. Aerodynamic smoother
3. Remove Pitot Static Probe
A. Hold pitot static probe and remove screws (6) from probe base.
B. Pull probe away from airplane skin far enough to remove connectors.
C. Disconnect pitot, static and heater connectors (Fig. 401).
D. Remove probe, gasket and then shim(s) as required.
E. Cap pitot and static lines and cover electrical connector with protective cover.
4. Prepare to Install Pitot Static Probe
A. Check gasket and shim(s) (as required) for aging and wear.
B. Remove aerodynamic smoother from probe base and external body skin.
5. Install Pitot Static Probe
A. Install gasket and shim(s) (as necessary) to assure flushness between pitot-static probe and airplane skin within +0.000 or -0.020 inch (SRM 51-70).
B. Position probe close to airplane skin and connect pitot, static and heater connectors.
C. Place probe into position and secure to airplane with screws (6).
D. Measure the resistance between strut of the pitot static probe and the airplane skin with a multimeter.
1. Make sure the resistance is less than 0.010 ohm.
D. Reseal around gasket and airplane skin with aerodynamic smoother.
NOTE: It is not necessary to apply the sealant immediately if the cure time will cause a flight delay. However, you must apply the sealant as soon as possible to keep moisture out of the area between the probe and the airplane skin.
E. Perform a pitot and static test for the replaced probe per 34-11-0 A/T.
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Sep 01/02 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-11-11 Page 401
H23860
Pitot Static Probe Installation 500
34-11-11Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/83
PITOT-STATIC PROBE - INSPECTION/CHECK
1. General
A. The inspection check visually inspects the pitot static probe for physical damage to the strut, head and precision-contoured surfaces and for foreign material in the static ports, drain hole and pitot opening. The pitot static probe should be replaced if it fails any of the visual inspections (AMM 34-11-11/401).
B. Fly Back Limits
(1)
Do these steps when you see pitot-static probe deterioration that you think is more than the inspection tolerances:
(a) You can dispatch the airplane from a base without maintenance facilities until one of these conditions occur: 1) 24 hours elapse 2) The airplane gets to a maintenance base.
(2)
Replace the pitot-static probe for one or more of these conditions:
(a)
The flight crew sees a cross panel airspeed difference that is more than stated below:
1) The airspeed difference must not be more than 3 knots when the airspeed is less than 250 knots and the altitude is below 20,000 feet.
(b)
There is structural damage to the pitot-static probe since the last flight.
2. Equipment and Materials
A. Assorted gages or wires - 0.004- to 0.020-inch, or Optical Micrometer - Model 966A1, Monocle Industries, Inc., P.O. Box 2426, Coppell, Texas 75019, or other suitable instrument, Pitot-Static Probe Tip Inspection Model 885N, Rosemount Aerospace, Inc., 14300 Judical Road, Burnsville, MN 55306-4898
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