Originally Posted by
phil gollin
.
Anyone know what the nominal pinger life is on the cockpit voice recorder ?
To which @
patplan stated: “…It was designed to last 30 days give and take….”
Not true. The correct answer is 90 days. Otherwise
patplan's comments (
post #1923) are worth pondering.
FWIW, from sleuthing around the web I present these findings, which now are pretty much inconsequential in the scheme of things:
Choice of recorder manufacturers seems to be a customer option.
The DFDR recovered from PK-LQP appears identical to the
FA2100 model manufactured by L3 Aviation Products.
Obviously the complete assembly was not recovered. Photographs released by investigators (example
here) show that divers retrieved only the armour encased memory unit with its attached beacon.
The pinger specs on this model conform to the
new regulatory requirements which from the beginning of 2020 require all underwater acoustic beacons to transmit for 90 days. Recorder manufacturers will produce upgrades for A/C fitted with older 30-day units (off topic).
Logically the CVR fitted in the accident A/C would most likely have been
L3 Aviation's sister product.
Here we are 35 days since the crash, and although the missing CVR's pinger unit should theoretically transmit for 90-days,
investigators reported 12 days ago that they can no longer detect the signal.
Quote from the above article:
" 'We're still putting in all our efforts to find the CVR [cockpit voice recorder],' National Transportation Safety Committee (KNKT) chief Soerjanto Tjahjono told the House of Representatives [on November 22]. The search team was
targeting an area with a radius of 300 meters using sonar and dredging mud from the sea floor, even though a signal initially heard from the recorder was now no longer being detected, he said."