(3)
Positive and negative temperature indication is controlled by the mechanical position of the rebalance/feedback system. System operation is reversed by switching the polarity of the dc bridge power supply when temperature readings pass through zero.
(4)
A yellow OFF flag is held out of view by an energized solenoid controlled by a failure monitor. The failure monitor allows the flag to drop into view upon sensing an excessive null voltage in the reposition/feedback system or the loss of 26-volt ac instrument power.
5C8
Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-14-0 Page 3
EFFECTIVITY
GJ ALL EXCEPT B2509 - B2510
K85187
Total Air Temperature Indicator Schematic 5C8
34-14-0 Figure 2 (Sheet 1) Jun 20/85
Page 4
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AIR DATA TEMPERATURE INDICATING SYSTEM -ADJUSTMENT/TEST
1. Air Data Temperature Indicating System Test
A. Equipment and Materials
(1) Thermometer accurate to士 0.50C.
B. Prepare to Test Total Air Temperature System
CAUTION: THIS TEST SHOULD EITHER BE PERFORMED BEFORE CHECKING HEATERS IN TEMPERATURE PROBE OR SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE THAT TEMPERATURE PROBE HAS RETURNED TO AMBIENT TEMPERATURE.
(1)
Apply electrical power.
(2)
Place thermometer adjacent to total air temperature probe. Shield from direct sunlight and wind.
(3)
Close total air temperature circuit breaker on P6 panel.
C. Test Total Air Temperature System
NOTE: For TAT values of (-60)0C or less and 600C or greater, the indicator will show horizontal bars.
(1)
On GJ ALL EXCEPT B2509-B2510, check that total air temperature indicator reads ambient temperature of probe within 士 40C.
(2)
On GJ B2509-B2510,
(a)
Open total air temperature indicator circuit breaker. Check that OFF flag is visible.
(b)
Close total air temperature circuit breaker. Check that OFF flag is not visible and total air temperature indicator reads ambient temperature of probe within士 20C.
(3)
Apply heat to probe and check that indicator shows increasing reading.
(4)
Apply cold to temperature probe and check that indicator shows decreasing temperature.
D. Return Airplane to Normal Configuration
(1)
Restore total air temperature system to normal and open circuit breaker.
(2)
Remove electrical power if no longer required.
5C8
Jun 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-14-0 Page 501
TOTAL AIR TEMPERATURE PROBE - REMOVAL/INSTALLATION
1. Remove Temperature Probe
A. Check that TOTAL TEMP circuit breaker is open and attach a DO-NOT-CLOSE tag..
B. Support probe and remove six mounting screws (Fig. 401).
C. Pull probe away from airplane to obtain access to electrical connector. Remove electrical connector from probe.
D. Remove gasket.
2. Install Temperature Probe
A. Install gasket (Fig. 401).
NOTE: Check to see that gasket is not damaged; replace if necessary.
B. Test probe per Total Air Temperature Probe - Adjustment/Test (ref 34-14-21/501).
C. Connect electrical connector to probe.
D. Position probe so that widest orifice is pointed forward and install six mounting screws.
E. Remove the DO-NOT-CLOSE tag and close the TOTAL TEMP circuit breaker.
F. Test probe per Air Data Temperature Indicating System - Adjustment/Test (ref 34-14-0/501).
G. Seal around the TAT probe and the airplane skin using BMS 5-95 class c sealant.
5B2 Total Air Temperature Probe Installation
May 01/01 Figure 401 34-14-21
Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TOTAL AIR TEMPERATURE PROBE - ADJUSTMENT/TEST
1. Total Air Temperature Probe Test
A. Equipment and Materials
(1) Ohmmeter - Type AN/PSM-6A
B. Test Total Air Temperature Probe
(1)
Look into the air inlet scoop and exhaust ports and check for foreign particles which block or partially block the free passage of air. If foreign particles exist, refer to Total Air Temperature Probe - Cleaning/Painting.
(2)
Remove electrical connector from temperature probe.
(3)
Check the temperature sensors by measuring the resistance between pins 3 and 4, and 2 and 5.
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