PITOT STATIC AND TEMPERATURE PROBE ANTI-ICING SYSTEM - ADJUSTMENT/TEST
1. Pitot Static and Temperature Probe Anti-Icing System Test
A. General
(1) The following procedure is provided to check the operation of the pitot static probe heater and temperature probe heater, and the continuity of each heater circuit individually and each corresponding indicator light circuit to the window and pitot heat module.
WARNING: DO NOT TOUCH PROBES WHILE HEATERS ARE ON. TEST HEATERS FOR OPERATION BY FEELING FOR HEAT RADIATION IN THE NEAR VICINITY OF HEATER BEING SUBJECTED TO TEST TO AVOID POSSIBILITY OF PERSONNEL BEING BURNED.
CAUTION: DO NOT OPERATE THE SYSTEM ANTI-ICING HEATERS FOR MORE THAN 5 MINUTES WHILE THE AIRPLANE IS ON THE GROUND. EXTENDED OPERATION MAY SHORTEN HEATER LIFE.
NOTE: A black oxide heat discoloration develops on the forward end of the pitot tubes when the heater is operated in still air. This is a natural phenomenon and does not indicate that the pitot tube is burned out.
B. Prepare Pitot Static and Temperature Probe Anti-Icing System for Tests
(1)
Remove any installed protective caps or covers from pitot tubes and outside air temperature probe.
(2)
Provide electrical power (Ref 24-22-0, M/P).
(3)
Check that the following circuit breakers are closed:
(a)
On P6 panel, MSTR CAUTION BUS
1) No. 1 BATT
2) BATT
(b)
On P6 panel, INDICATOR LTS MASTER DIMMING BUS 1) No. 1 DC 2) No. 2 DC
(c)
On P6 panel, DIM & TEST
(d)
On P6 panel, INDICATOR
1) F/O's PITOT STATIC (If installed)
2) CAPT'S PITOT STATIC (If installed)
(e)
On P18 panel
1) LEFT SIDE WINDOW
2) RIGHT SIDE WINDOW
(f)
On P6 panel
1) MASTER CAUTION - ANTI-ICE (If installed)
(4)
Open the following circuit breakers:
(a) On P18 panel, HEATERS - PITOT STATIC
1) CAPT - UPPER L
2) CAPT - LWR R
3) F/O UPPER R
4) F/O LWR L
5) ELEVATOR PITOT - L
6) ELEVATOR PITOT - R
7) TEMP PROBE - L
8) TEMP PROBE - R
(5)
On P5 panel check that PITOT-STATIC A & B switches are in OFF position.
(6)
On P5 panel, check that all pitot static and temperature probe anti-icing system indicator lights are on.
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May 15/81 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 30-31-0 Page 501
C. Test Pitot Static and Temperature Probe Anti-Icing System
NOTE: Master caution lights and ANTI-ICE annunciator will be on for steps (1) through (4).
(1)
Test upper left pitot static probe heater and indicator light.
(a)
Close CAPT-UPPER L circuit breaker and position PITOT-STATIC B switch to ON. 1) Check for following results: a) All pitot-static probe heaters remain off and indicator lights remain
illuminated.
2) Position PITOT-STATIC B switch to OFF.
(b)
Position PITOT-STATIC A switch to ON. 1) Check for following results: a) CAPT P/S 1 AUX STATIC indicator light goes out; all other lights remain
on. b) Upper left pitot-static probe radiates heat; all other heaters remain off.
(c)
Open the CAPT-UPPER L circuit breaker and check that CAPT P/S 1 AUX STATIC light illuminates. Position PITOT-STATIC A switch to OFF.
(2)
Repeat step (1) for lower left pitot-static, left elevator pitot, left temperature probe heater, using respective circuit breakers, switch and indicator lights.
(3)
Test upper right pitot-static probe heater and indicator light.
(a)
Close F/O-UPPER R circuit breaker and position PITOT-STATIC A switch to ON. 1) Check for following results.
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