posted on Apr, 27 2014 @ 08:19 AM
a reply to: Zaphod58
OK, it is not unusual though for the airline to perform maintenance in house, or through an approved vendor / service provider, rather than sending
the unit off to the OEM. It would be possible that the airline's MRO has a part pool agreement, where by the old unit is just swapped for a new unit.
No in the case of terminology, the use of the word pinger I find is a sill dumbed down term used by the MSM, for the benefit of the sheeps. Just to
elevate our own understanding, the "pinger" is called the Underwater Locator Beacon (ULB), the standard part number is DK120. One is fitted on both
the CVR and DFDR, and are subject to routine replacement. Spare ULBs can be bought on the aftermarket quite easily.
This are different from the ELT's which are seperate units broadcasting through services like Cospas Sarsat at 406 Khz. These too have battery packs
that need to be replace periodically. Again after market rules apply.
Of course, for a national carries like Malaysian, it would not be beyond possibility that they hold shop approvals to perform this maintenance
themselves, that way the only ones who know the true maintenance status of the aircraft, is their own engineering and maintenance departments.