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CVR CB Pull Out.

HAWK21M From India, joined Jan 2001, 30162 posts, RR: 61
Posted (4 years 5 months 6 days 2 hours ago) and read 1594 times:

The CVR CB is pulled out post last flight of the day on our B757s,while stays in during all in between Transit halts,On the B737 its pulled at end of every Sector.

Whats the SOP at your Airline & any reason for this.

regds
MEL

Think of the brighter side!

12 replies: All unread, jump to last

MissedApproach From Canada, joined Oct 2004, 711 posts, RR: 2
Reply 1, posted (4 years 5 months 6 days 2 hours ago) and read 1588 times:

It's been noted in a few Canadian TSB reports that the CVR has been useless in some incident investigations since it looped over the recorded event (runway overrun, IIRC). I suspect in a few years we'll see a checklist item added to preserve this evidence.

Can you hear me now?

Fr8mech From United States of America, joined Sep 2005, 3059 posts, RR: 7
Reply 2, posted (4 years 5 months 5 days 23 hours ago) and read 1552 times:

We don't pull them at all. The benefits of a DCVR and DFDR.

Used to pull them after each flight ad during maintenance engine runs and taxi.

When seconds count...the authorities are minutes away!

Avt007 From Canada, joined Jul 2000, 2131 posts, RR: 6
Reply 3, posted (4 years 5 months 5 days 23 hours ago) and read 1545 times:

CARS (Canadian regs) now require a 120 minute CVR for all aircraft manufactured after 2003, approximately. Otherwise, even with 30 minute CVRs, I've never heard of pulling the CB. I can't see the point, unless your airline uses the CVR for purposes other than accident investigation. At our airline, the pilots contract specifies that the company may not use the CVR recordings for purposes other than accident investigation.

HAWK21M From India, joined Jan 2001, 30162 posts, RR: 61
Reply 4, posted (4 years 5 months 5 days 20 hours ago) and read 1526 times:

Quoting Fr8mech (Reply 2):
Used to pull them after each flight ad during maintenance engine runs and taxi.

Quoting Avt007 (Reply 3):
At our airline, the pilots contract specifies that the company may not use the CVR recordings for purposes other than accident investigation.

Shouldn't Ground Runs have the CB in.
regds
MEL

Think of the brighter side!

Lowrider From United States of America, joined Jun 2004, 3220 posts, RR: 12
Reply 5, posted (4 years 5 months 5 days ago) and read 1453 times:

On our parking checklist, there is an item where you pull the CVR CB if an NTSB reportable event occured during the flight.

Proud OOTSK member

Avt007 From Canada, joined Jul 2000, 2131 posts, RR: 6
Reply 6, posted (4 years 5 months 4 days 18 hours ago) and read 1416 times:

Quoting HAWK21M (Reply 4):
Shouldn't Ground Runs have the CB in.

At our airline, the CB is always in.

Fr8Mech From United States of America, joined Sep 2005, 3059 posts, RR: 7
Reply 7, posted (4 years 5 months 3 days 23 hours ago) and read 1359 times:

Quoting HAWK21M (Reply 4):
Shouldn't Ground Runs have the CB in.

We used to pull them, when a foil spool was the recording medium. That is no longer the case. CB's in for all runs and taxi.

When seconds count...the authorities are minutes away!

GRZ-AIR From Austria, joined Apr 2001, 564 posts, RR: 5
Reply 8, posted (4 years 5 months 3 days 13 hours ago) and read 1325 times:

Some CVR's have an erase button.. always wondered if it's a dummy or if it really works.. helps you to distinguish if it's a pilot friendly airplane or not Wink

(joke)!

When I joined A.net it was still free, haha ;).

Avt007 From Canada, joined Jul 2000, 2131 posts, RR: 6
Reply 9, posted (4 years 5 months 2 days 19 hours ago) and read 1284 times:

If it was up to me, I'd remove all erase buttons. I can't imagine they'd be allowed if the CVR had been invented today.

HAWK21M From India, joined Jan 2001, 30162 posts, RR: 61
Reply 10, posted (4 years 5 months 2 days 13 hours ago) and read 1255 times:

Quoting GRZ-AIR (Reply 8):
Some CVR's have an erase button.. always wondered if it's a dummy or if it really works.. helps you to distinguish if it's a pilot friendly airplane or not (joke)!

Quoting Avt007 (Reply 9):

If it was up to me, I'd remove all erase buttons. I can't imagine they'd be allowed if the CVR had been invented today.

The Erase button works when pushed with Parking brake set.However the Regulatory Authorities have issued a Mandatory mod out here to deactivate this mechanism by removing the Connection to the particular card to avoid misuse.Rightly so.

regds
MEL

Think of the brighter side!

Lowrider From United States of America, joined Jun 2004, 3220 posts, RR: 12
Reply 11, posted (4 years 5 months 2 days 7 hours ago) and read 1240 times:

Quoting Avt007 (Reply 9):
If it was up to me, I'd remove all erase buttons. I can't imagine they'd be allowed if the CVR had been invented today.

Usually its only used for test functions. Besides, its usually the FDR that hangs you, not the CVR.

Proud OOTSK member

HAWK21M From India, joined Jan 2001, 30162 posts, RR: 61
Reply 12, posted (4 years 5 months 1 day 20 hours ago) and read 1199 times:

Quoting Lowrider (Reply 11):
Usually its only used for test functions

Thats not the point.Misuse either Deliberately or accidentally is.
regds
MEL

Think of the brighter side!

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