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--Aug 01/04 ---CES -
R R R (2) On the AIR COND panel 30VU, push the APU BLEED pushbutton switch (5HV) (the ON legend comes on).
4. Fault Isolation_______________
A. On the upper ECAM DU, if the AIR R WING LEAK warning comes into view: - do a leak test on the bleed air ducts (Ref. AMM TASK 36-22-00-790-001).
(1) If there are leaks: - replace the defective ducts or seals as necessary.
(2) If there is no leak: - do a hot-air leak check in the air conditioning bay (Ref. AMM TASK 21-52-00-200-010).
(a) If there are cracks or damage on the ducts: - replace the defective ducts.
(b) If there are leaks on the seals: - replace the defective seals.
5. Close-up________
R A. Put the aircraft back to its initial configuration.
R R (1) On the AIR COND panel 30VU, release the APU BLEED pushbutton switch (5HV) (the ON legend goes off).
R R R R R R (2) Stop the APU: - GTCP 36-300 (Ref. AMM TASK 49-00-00-860-004) or - APS 3200 (Ref. AMM TASK 49-00-00-860-006) or - 131-9(A) (Ref. AMM TASK 49-00-00-860-009).
R R (3) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
R R (4) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
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1. Typical Method of Trouble Shooting to Isolate the Faulty Element of the
_______________________________________________________________________ Overheat Detection System
A. Recommendations
(1)
You must only use AC resistance meters with the characteristics that follow to make sure that the overheat detection system operates correctly:
-
a maximum test voltage of 1VAC RMS
-
a test signal of 1KHZ
-the possibility to measure the resistance value of a resistor which is in parallel with a capacitor.
(2)
The sensing element of the overheat detection loop is serviceable when its measured insulation resistance is:
-
for the APU loop more than 3 Kohms
-
for the wing loops more than 3 Kohms
-
for the engine/pylon loop more than 17 Kohms.
(3)
When you do the trouble shooting of a loop that you think is unserviceable, use the usual techniques for electrical fault isolation, i.e. divide the system to find the location of the fault. After the end of the trouble shooting procedure, you must do a continuity check to make sure that the system operates correctly.
(4)
Do not use DC meters because these can cause damage the sensing elements.
(5)
There are no temperature or time restrictions when you use an AC resistance meter.
B. Typical Method (for example : sensing element 16HF)
(Ref. Fig. 301)
(1)
Make sure that the APU and the engines are not in operation.
(2)
Put warning notices to prevent personnel not to start the APU or the engines.
(3)
Open, safety and tag circuit breaker 2HA1 on this panel 122VU.
(4)
Disconnect connector AA from the BMC1.
(5)
Use an AC resistance meter (1VAC RMS maximum 1KHZ, test signal) to do a check of the resistance between pin 7B and ground.
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--Nov 01/99 ---CES -R Illustration of the leak detection - Electrical schematic R Figure 301
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(6)
If the reading is below 3 Kohms, isolate half the loop to divide the system. To do this disconnect the connector between the sensing elements 16HF and 15HF. Do again a check of the resistance between pin 7B and ground. If the resistance is above 3 Kohms, this is an indication that the faulty element is located between the sensing elements 16HF and 19HF.
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