The Electrical Master Chip Detector indication is popped out - Engine 2

TASK 79-00-00-810-834-A
The Electrical Master Chip Detector indication is popped out - Engine 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 79-00-00-200-001	Operational Check of the Master Chip Detector Remote Indication
AMM 79-00-00-281-002	Check of the Electrical Master Chip Detector (EMCD) for Particles
AMM 79-21-30-000-001	Removal of the Visual Indicator
AMM 79-21-30-400-001	Installation of the Visual Indicator
AMM 79-21-30-440-001	Resetting of the Visual Indicator
ASM 793601

3. Fault Confirmation
Subtask 79-00-00-710-111-A ** ON A/C NOT FOR ALL

A. Test.
(1) Not applicable.

NOTE: The visual indicator is popped out if a magnetic particle is or has been captured by the Electrical Magnetic Chip Detector (EMCD).

NOTE: Nuisance detections can be experienced during early revenue service operation (up to 1.000 hours since engine new or since shop visit). Residual machining debris can be present in the engine oil system. Whenever a magnetic debris is dislodged (usually during early revenue service), it will be transported by the oil and captured by the Electrical Master Chip Detector.
In this case, it's not abnormal that no contamination is found on the magnetic chip detector at the time of the inspection since an isolated particle may have been dislodged from the chip detector magnet between the time it was captured and the time of the inspection.

4. Fault Isolation
Subtask 79-00-00-810-097-A ** ON A/C NOT FOR ALL

A. Do this procedure:
(1) If the Visual Indicator has popped out:

NOTE: The inspection of the Electrical Master Chip Detector can be deferred to the next convenient maintenance opportunity when trained personnel can perform the inspection without interfering with revenue service operation.

(a) Do a check of the Master Magnetic Chip Detector for particle AMM 79-00-00-281-002.

Reset the visual indicator AMM 79-21-30-440-001.
No further maintenance action is required.

(b) If the indicator pop-out detections are repetitive and particles are never found:

Inspect/check the electrical magnetic chip detector system AMM 79-00-00-200-001.

(2) If the EMCD circuit breaker 4EN has tripped Off in the cockpit on panel 121VU:

Replace the visual indicator AMM 79-21-30-000-001 and AMM 79-21-30-400-001.

(a) If the circuit breaker trips again:

Replace the electronic master chip detector 4007EN.

1 If the circuit breaker trips again:

Check the electrical wiring between EMCD 4007EN and circuit breaker 4EN ASM 793601.

Subtask 79-00-00-710-112-A ** ON A/C NOT FOR ALL

B. Check the Visual Indicator pop-out after the next flight.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.

[Rev.8 from Aug 2018] 2026.04.04 04:38:22 UTC