3. Job Set−Up
WARNING: MAKE SURE THAT THE AIRCRAFT STAYS IN A WEIGHT−ON−WHEELS (WOW)
CONDITION AT ALL TIMES. A WEIGHT−OFF−WHEELS CONDITION CAN CAUSE
INCORRECT TCAS ADVISORIES ON AIRCRAFT THAT OPERATE IN THE AREA.
A. Make sure that the aircraft is in the standard configuration for maintenance
(TASK 12−00−00−867−801).
B. Obey all the electrical/electronic safety precautions (TASK 24−00−00−910−801).
C. Connect the electrical power to the aircraft (TASK 24−00−00−861−801).
WARNING: OPEN, SAFETY, AND TAG THE CIRCUIT BREAKERS FOR THE HEATERS OF
THE PITOT−STATIC SYSTEM. THE AIR DATA SENSORS CAN GET VERY HOT
AND CAUSE BURNS.
D. Open and tag the circuit breakers that follow:
CB−PANEL CB−NO NAME
CBP−1 A12 HEATERS TAT
CBP−1 A13 HEATERS AOA R
CBP−1 A14 HEATERS PITOT R
CBP−1 G14 HEATERS STATIC R
CBP−1 Q2 STALL PROT L CH
CBP−1 LOWER T7 HEATERS PITOT L
CBP−1 LOWER T8 HEATERS AOA L
CBP−1 LOWER T9 HEATERS PITOT STBY
CBP−1 LOWER V10 TCAS
CBP−2 H8 XPDR 2
CBP−2 LOWER S1 HEATERS STATIC L
CBP−2 LOWER U5 STALL PROT R CH
CBP−2 LOWER V5 XPDR 1
Refer to Figure 503
E. If you use ATC−601 test set, prepare the test set as follows:
(1) Move all large metal objects located in a 180 degree arc in front of the ATC antenna to a
distance of 40 feet away from the antenna.
(2) Install the test antenna on a tripod.
CRJ-900
AIRCRAFT MAINTENANCE MANUAL
PSA AIRLINES, INC REVISION
EFFECTIVITY: Ref page 1 of Blue Page
34-54-00-720-802-PSA Rev A
AMM - Insert after Task 34-54-00-720-802-A01 of AMM 34-54-00
Remove Rev 34-54-00-720-802PSA dated Sep 17/14 and insert 34-54-00-720-802-PSA Rev A dated 10/12/15
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