Display Unit Replacement on A320 - First Officer Navigation Display Replacement on Airbus 320 Aircraft

Today I replaced the First Officer Navigation Display Unit due to Display Unit failure.

The Display Unit fault has been considered as a differed defect.


First, I checked the new Display Unit condition and Part Number.

Then I pulled the First Officer Navigation Display Circuit breaker.

I removed the decoration around the Display Unit.

I pulled the handle that was securing the Display Unit.

Then I removed the old Display Unit from its place.

And then the new Display Unit is placed in its place.

Secured the handle in the correct position.

The new Display Unit takes about 20 seconds to load its software from the DMC (Display Management Computer)

The it's working normally.

The decoration is fixed.

I pushed the circuit breaker in its closed position.

And then checked the new Display Unit operation.

And finally I made an entry in the aircraft technical log book.


AMM: 31-63



REF: CA

Weekly Check and Charging Batteries of a grounded Aircraft

Today I carried out a weekly check on a grounded aircraft.

Usually, normal aircrafts must undergo a weekly check that is due every seven calendar days.

Although this aircraft is grounded due to a structural damage that is being repaired, but this aircraft must also undergo weekly and daily checks also.

And this is also important to keep the batteries live and working.

As a normal weekly check item, I have checked the main batteries voltage and found it about 24 Volts.

This is still within normal operating limits but needs to be fully charged.


So I pushed in the two main batteries switches to operate the Battery Charge Limiter BCL of each one.

This enables them to be fully charged on board the aircraft during normal operation procedure.

At the beginning of the charging process there appears that the batteries are charged with relatively higher currents.

And then as the batteries voltages gets near the nominal 28 Voltages it gradually drops decreases.

And finally when it reaches 28 Voltages it means that the batteries are fully charged and no current is being drawn from them.

And then I put the batteries switches to the OFF position.

REF BSM

Replacing FMGC on A320 Aircraft - Auto Pilot Computer Replacement

Today I've replaced the FMGC Flight Management and Guidance Computer on the A320 Aircraft.

This was due to the differed defect of the FMGC#2.

I started by opening the 824 door which contains most Avionics Computers.

And then I brought the new FMGC computer which will replaced the defected computer.

And then I started to loosen the screws to get the defected unit out.

And then I got it out and recorded its Part and Serial Numbers.

And then I started to cross load the software from the FMGC #1 into FMGC #2 to keep the software in the two computers identical.

And here is after the process has finished and the two computers were identical and worked normally in conjunction with each other.

 The FMGC is the computer that includes the Autopilot functions. It also includes the Flight Guidance and Management Functions.

REF SU-BPV