Why are logo lights included in the (M)MEL?

[Guest 112233]

I know you pilots & engineers get annoyed with SLF

From an uninformed passengers perspective, I can imagine there are circumstances where the logo lights i.e interception at night in sensitive airspace where these logo illumination lamps would be of vital importance in helping verify that the aircraft was in fact an airliner. Sorry if it annoys the professionals Mods. But a few SLF do know what a MEL list is.

Please delete this mesage if its not relevent

Thanks

CAT III

[morton]

Logo lights, when installed, are part of the Aircraft system. As such there are Airworthiness considerations, as in any lighting system, when they go wrong. The ANO dictates the lighting ‘must haves’ and the MEL time periods reflect the importance of the systems. Logo lights with a 120 day period are, obviously, not very important in the grand scheme of thing but are still Airworthiness items whether or not they are mentioned in the ANO.
It is my understanding that the MMEL is produced by the Manufacturer. From this the Operators can produce their own MEL that must be as, or more, restrictive than the MMEL. This MEL must pass scrutiny by the Operators NAA so that regional differences are incorporated.

p.s. Big Bad D. If you have the opportunity, can you do some modifications on the A320 series logo lights? Increasing the length of the connecting wires would be a good start. Playing ‘dropsy’ with the attaching screws to the SBU falling into the cavity below is no fun on cold and windy nights and more than doubles the time of the job as you have to remove the lower surface panel to remove these screws!

[barit1]

FlightDetent quotes the MMEL preamble - the MEL SHOULD cite only those items which have some effect on airworthiness. If there is a pencil sharpener on board, must it be in the MEL?

But are logo lights required by airworthiness regulations? I think not - althought they are a convenience in airfield ops.

[smudgethecat]

Maybe the view was taken that as the logo lights are part of the external lighting system if there not working it may be reasons more serious than a u/s filament, and those reasons need to be investigated sooner rather than later

[Pugilistic Animus]

Cat111 NDB---

From: John_tullamarine
(b) this means ALL the design standards, many of which are not known to the typical flyer, have to be included in (M)MEL assessments

so yeah -- maybe