(2)
Visually inspect the pitot-static probe for physical damage to its precision-contoured surfaces and for foreign material in the static ports, drain hole and pitot opening. To remove the foreign material, refer to AMM 34-11-11/401.
(3)
Check for any detectable bending or twisting of the head or strut sections of the pitot-static probe.
B. Aerodynamic Contour Condition
(1)
Check the static pressure ports to make sure their edges remain perpendicular to the probe's machined contoured surface. Rounded or raised static port edges should not exceed 0.003 inch (Fig. 601).
(2)
Check for scratches, nicks or surface irregularities located within 0.5 inch of the static ports, and deeper than 0.015 inch.
(3)
Check for defects exceeding 0.025 inch over the rest of the head, and exceeding 0.125 on the strut section of the probe.
501
May 01/01 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-11-11 Page 601
C. Pitot Tip Condition (WITHOUT PITOT-STATIC PROBE INSPECTION KIT)
(1)
The leading edge lip of the pitot opening should be sharp. New tubes are sharpened to a
0.004 +0.002 flat. The tube must be removed if the lip has been eroded through wear, or dented by abuse, to the extent that the lip has a flatness greater than 0.015 inch. Figure 602 shows this condition.
(2)
The outer surface of the lip edge must be smooth. It cannot be curled or flared outward. This condition can be detected by sliding your fingernail along the outer surfaces at the tip. The tube should be removed if the lip edge is curled or flared outward. Figure 603 illustrates this condition.
(3)
The lip can have small inward dents which affect the roundness of the pitot opening, as shown in Fig. 604. The tube must be removed if the indentation exceeds 0.030 inch from the normal tip diameter. The dent may be at any location around the opening, but must not affect more than 20% of the lip circumference.
(4)
The leading edge lip can have small nicks or chips as shown in Fig. 605. The tube must be replaced if two of the nicks are between 0.025 and 0.035 inch deep. The tube must also be replaced if any one nick exceeds 0.035 inch deep.
(5)
Install or replace the pitot static probe (AMM 34-11-11/401).
D. Pitot Tip Condition (WITH PITOT-STATIC PROBE INSPECTION KIT)
(1)
Examine the pitot tip of the probe with the inspection kit.
(2)
Replace the pitot-static probe if the inspection shows an out of tolerance condition (AMM 31-11-11/401).
G40534
Inspection Criteria for Static Ports 501
34-11-11 Figure 601 May 01/01
Page 602
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
501 Chips Or Nicks In Probe Tip
Oct 20/85 Figure 605 34-11-11
Page 603
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PITOT STATIC PROBE - CLEANING/PAINTING
1. Cleaning
A. Internal
(1)
To remove foreign materials lodged in the pitot opening, static ports or drain hole, disconnect the pitot static probe pressure lines and blow compressed dry air through the line and out the ports. Maximum air pressure to be used is 60 psi.
(2)
If the forced air method fails to remove the foreign material, remove the pitot static probe from the airplane (Ref 34-11-11, Pitot Static Probe - R/I). Soak or flush the unit with clean water, drain it and repeat (1).
CAUTION: DO NOT USE FLUIDS THAT CONTAIN SODIUM CHLORIDE OR SULFUR COMPOUNDS TO CLEAN THE PROBE. SODIUM CHLORIDE AND SULFUR CAN CAUSE PREMATURE FAILURE OF THE PROBE.
(3)
If the forced air and soaking methods do not clean the drain hole because of its small size, cleaning may be accomplished by manually inserting first a 0.025 drill rod and then a
0.029 drill rod into the drain hole.
CAUTION: CARE MUST BE TAKEN SO THAT THE DRAIN HOLE IS NOT ENLARGED DURING THE CLEANING PROCESS (DRAIN HOLE DIAMETER IS 0.031 +0.001 INCH).
B. External
(1) To remove foreign material from external surfaces, wash them with clean water and dry them with a soft cloth.
CAUTION: DO NOT PROBE INTO THE STATIC PORTS WITH ANY OBJECT. DO NOT EXPOSE PITOT-STATIC TUBES TO SOLVENTS, LUBRICATING OIL AND/OR GREASE. DO NOT SCOUR OR BUFF THE MACHINED CONTOUR SURFACE.
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