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-   -   Parking Brake Release (https://www.pprune.org/tech-log/406361-parking-brake-release.html)

Centaurus 22nd February 2010 13:06


Just an awarness tool ..
My wife liked mine when we were younger, too.

mvsb1863 22nd February 2010 14:13

Quote:

The EICAS message disappears, yes, but the bang is nice to confirm with all in the flight deck, not just the FO, that the brakes release has been performed, whilst no visual identification is required.

Hey, do you really need to hear a bang in order to confirm the brake release ???? You all must be kidding me.

zeus_737 22nd February 2010 14:26

something similar and not so same
 
on a similar line.. in regards to make a noise... a trainer once told me tht when u land u should slam the thrust lever to idle(A 320) since the noise helps in reconfirming tht the thrust is idle jus in case... :P
utter nonsense.... and about the brake release... well most DFDR def have parking brake status as an important parameter.... hence the whole question of makin a racket with the lever shouldn't really arise...and ofcourse... 'parking brake released' is a very pragmatic call...

iflytb20 22nd February 2010 17:27

A few years back we had a peculiar incident with regard to the Parking Brake. The P1 released the brakes and then cushioned the lever to avoid the noise. The Parking Brake light went out but during TO the config warning came on. On investigation it turned out that though the lever had left the full position, it never returned to the neutral posn and somehow managed to keep the brake lines pressurised.

After that the "unofficial" rule was to let the lever release with the bang - atleast we will know that it has released. :confused:

PS: I'm talking about a B738.

Avenger 23rd February 2010 13:24

What sort of a/c are you guys operating, on the NG and 76, 777 the parking brake is practically silent on release.. I would have to hit it with the axe to get any noise:confused:

for info the CVR is on all the time electrical power is established in flight and only after engine start on the ground.. and given the flurry of visitors to the flight deck before start it makes sense.

Capt Claret 23rd February 2010 21:45

From the Douglas/Boeing 717 FCOM.


The CVR operates automatically and continuously whenever power is available to the airplane. No crew action is required.

Avenger 24th February 2010 15:49

From the B737NG systems manual quote:

Normal ( guarded position)-

. In flight- the recorder operates anytime electrical power is available

. On the ground- either engine must also be operating

TEST- Powers the flight recorder on the ground
:ok:

iflytb20 24th February 2010 16:02

@avenger

In our fleet we have 2 methods of CVR activation.

In the leased acfts, you need BOTH AC power and either engine N2 > 50%. So our SOP directs us to manually start the CVR in the Preflight Procedures by moving the Voice Recorder switch to ON. It automatically goes to the AUTO position when either engine accelerates to 50% N2.

But in our own acfts, the CVR runs continuously whenever the AC Busses are powered. So in those acfts, we have to pull the CVR CB at the end of the flight day to prevent the erasure of the recordings and to permit CVR downloads for FOQA purposes

PS: Oops. Didn't notice you were talking about the FDR. My bad :uhoh:


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