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(d) Flush the left pitot line with 0-30 psig dry filtered regulated air source, STD-1280 not more
than 15 psig (698 knots/103.4 kPa) for 3 minutes.
NOTE: Flush the pitot line at a different time from the probe end, elevator feel computer
end, and restrictor valve end.
(e) Flush the right pitot line with 0-30 psig dry filtered regulated air source, STD-1280 not more
than 15 psig (698 knots/103.4 kPa) for 3 minutes.
(f) Connect the pitot lines to the pitot probes.
(g) Connect the pitot lines to the elevator feel computer.
(h) Install the restrictor valves.
SUBTASK 27-31-17-170-002
(2) Flush the static system:
(a) Disconnect the static lines from the elevator feel computer.
(b) Flush the static lines from each ends with 0-30 psig dry filtered regulated air source,
STD-1280 not more than 15 psig (698 knots/103.4 kPa) for 3 minutes.
(c) Connect the static lines to the elevator feel computer.
SUBTASK 27-31-17-210-001
(3) Make sure that there is no particle or roughness in all ports in the pitot-static system.
SUBTASK 27-31-17-790-001
(4) Do this task: Elevator Pitot System Leak - Test, TASK 27-31-17-790-801.
F. Put the Airplane Back to Its Usual Condition
SUBTASK 27-31-17-410-001
(1) Close this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
SUBTASK 27-31-17-410-002
(2) Install this access panel:
Number Name/Location
323FL Vertical Fin, Access
------------------------- END OF TASK ---------------------------
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Elevator Pitot-Static System Installation
Figure 201 (Sheet 1 of 3)/27-31-17-990-801
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Elevator Pitot-Static System Installation
Figure 201 (Sheet 2 of 3)/27-31-17-990-801
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Elevator Pitot-Static System Installation
Figure 201 (Sheet 3 of 3)/27-31-17-990-801
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TASK 27-31-17-200-801
3. Elevator Pitot-Static System Drainage - Inspection
(Figure 201)
A. Consumable Materials
Reference Description Specification
B00065 Alcohol - Denatured, Ethyl (Ethanol) 27CFR21.35
B00068 Alcohol - Ethyl (Denatured) AMS 3002F
(MIL-E-51454,
Type II)
B00130 Alcohol - Isopropyl TT-I-735
B. Location Zones
Zone Area
311 Area Aft of Pressure Bulkhead - Left
312 Area Aft of Pressure Bulkhead - Right
323 Vertical Fin - Front Spar To Rear Spar
C. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
323FL Vertical Fin, Access
D. Prepare for the Inspection
SUBTASK 27-31-17-010-003
(1) Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
SUBTASK 27-31-17-010-004
(2) Remove this access panel:
Number Name/Location
323FL Vertical Fin, Access
E. Elevator Pitot-Static System Drainage Inspection
SUBTASK 27-31-17-170-003
(1) Drain the pitot system:
(a) Remove the restrictor valves from the pitot lines.
(b) Make sure the pitot lines have proper drainage. Check the hoses between the Elevator Feel
System pitot-static probes and the associated rigid metal tubing to ensure that the hoses
loop upward so that they do not trap water (Figure 201).
(c) If it is necessary, flush the pitot system. To flush it, do this task: Elevator Pitot-Static
System Flushing, TASK 27-31-17-170-801.
(d) Clean the restrictor valves with solvent.
NOTE: Use either alcohol, B00130, alcohol, B00065, or alcohol, B00068.
(e) Install the restrictor valves.
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