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747-400 MAINTENANCE MANUAL
ENGINE PT2/TT2 PROBE ANTI-ICE SYSTEM - ADJUSTMENT/TEST
______________________________________________________
1. General_______
A. This task is a system test for the Engine PT2/TT2 Probe Anti-Ice System. The test has these parts:
-
Put the air/ground relay system in the air mode
-
Put the engine N2 speed cards to the test mode
-Feel near the probes to make sure that they become hot
-Look to see that EICAS messages show at the correct times
B. There will be damage to the PT2/TT2 probes if the probe heaters are energized for too long with the engines off. After the probe heaters are energized for 30 seconds, remove power from them for 5 minutes or more. This will let let them become cool before they are energized again.
TASK 30-34-00-735-001
2. System Test - Engine PT2/TT2 Probe Anti-Ice System__________________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 32-09-02/201, Air/Ground Relays
(3)
SSM 30-34-01, SSM 30-34-02, SSM 30-34-03, SSM 30-34-04
(4)
WDM 30-34-11, WDM 30-34-21, WDM 30-34-31, WDM 30-34-41
B. Access
(1) Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
411 Inlet Cowl - Engine 1
421 Inlet Cowl - Engine 2
431 Inlet Cowl - Engine 3
441 Inlet Cowl - Engine 4
C. Preconditions
S 865-034
(1) These conditions are necessary for this task:
(a) Electrical power on (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
(b)
Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).
(c)
Air/Ground Relay System is serviceable (AMM 32-09-02/201).
D. Prepare For the Test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-004
(2)
Close these circuit breakers on the P6, Main Power Distribution Panel:
(a)
6D30, PROBE HEAT PITOT L
(b)
6D31, PROBE HEAT PITOT R
(c)
6D32, PROBE HEAT AUX PITOT L
(d)
6D33, PROBE HEAT AUX PITOT R
(e)
6D28, PROBE HEAT TAT L
(f)
6D29, PROBE HEAT TAT R
(g)
6C33, AOA HEAT L
(h)
6C34, AOA HEAT R
S 045-005
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO PREPARE
_______ THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3) Do this task: "Prepare Safety-Sensitive Systems for Air Mode Simulation" (AMM 32-09-02/201).
E. Engine 1, PT2/TT2 Probe Heat Test
S 865-006
(1)
Open these circuit breakers on the P6, Main Power Distribution Panel:
(a)
6H21, PROBE HEAT ENG 2
(b)
6H23, PROBE HEAT ENG 3
(c)
6H25, PROBE HEAT ENG 4
(2)
Get access to the engine 1, PT2/TT2 probe.
(3)
Do a check of the probe heater operation in the air mode:
S 015-008
S 715-009
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747-400
MAINTENANCE MANUAL
CAUTION: DO NOT OPERATE THE PROBE HEATERS FOR MORE THAN 30 SECONDS.
_______ STOP FOR 5 MINUTES AFTER YOU OPERATE THE PROBE HEATER. YOU WILL DAMAGE THE PROBE IF YOU OPERATE THE PROBE HEATER FOR TOO LONG.
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