I'm sad that we must read so much non-sense written by people who claim to be pilots.
tolipanebas wrote:sean1982 wrote:
But explain this: if parking brake pressure releases because of a depleted accumulator then how would
somebody in the flightdeck be able to apply brake pressure????
Ever heard of an APU?
Yes, the parking brake releases after the accumulator is depleted and Mr. Tolipanebas is going to calmly do the fire warning test and start up the APU.
In the meanwhile the aircraft is rolling and rolling and BAM! It goes much faster than you think.
I think that there is a faster, much more obvious option in the above described scenario, and it's a bit concerning that a pilot wouldn't mention it instinctively... it's called the DC pump.
Also, the note in the parking procedure is interpreted conveniently in the wrong way by Tolipanebas, obviously. So even interpreting a simple FCOM note seems to pose a challenge...
I'm surprised no one noticed this:
tolipanebas wrote:Inquirer wrote:Would be interesting to hear from lysexpat or any other Boeing pilot if indeed Boeing allows you to leave the plane behind without chocks in their handbooks?
As an ex-737 pilot, let me answer that question for you unambiguously:
NO.
1- From the Normal Procedures - Amplified Procedures in the Boeing FCOM:
"Note: Do not assume that the parking brake will prevent
airplane movement.
Accumulator pressure can be
insufficient."
(...)
Not much room for pilot interpretation, is there?
Tolipanebas conveniently removes the "accumulator pressure can be insufficient" in subsequent postings.
This note is a reminder to check and monitor the brake pressure and not assume that such pressure is available any time you set the parking brake or leave it set for a defined period of time.
It's not saying that the parking brake is an unreliable means of securing the aircraft. In fact, the B737 Classic Maintenance Manual says that the parking brake is the method of securing the aircraft until chocks are in place.
Chocks should be placed ASAP, but ASAP is different from immediately, when chocks are not available for whatever reason. So until the chocks are available, you secure the aircraft with parking brakes, which on the B737NG last a minimum of 8 hours on a full charge of the accumulators.
It's the captain's responsibility to make sure his aircraft is properly secured, yet as so many things, this is a task that is always delegated, so as Tolipanebas conveniently said in a deicing debate, "you must trust the people whom you delegate to to do their jobs properly. You can't run around as a captain making sure each and every time". His words, not mine.
In addition, we don't know the circumstances of the accident... for all we know, some disgruntled handlers may just have pulled the chocks to prove a point, and may have gotten more than he had bargained for.
As I said, Tolipanebas, you will only embarass yourself further, so I kindly suggested and still suggest to not embarass yourself any further, as it will only expose holes in your Swiss Cheese that are going to make people start asking questions and doubting yourself.
You may have been taught to not trust your parking brake for whatever reasons, but it does not justify your accusations towards FR procedures in this particular case, as you have no reliable information nor cues as to what happened, and you're filling the blanks of your knowledge with half-truths.
Also, as I already said, it also has happened at BRU that aircraft could not be secured with the chocks owing to lack of chocks. So who knows maybe this happens at your won airline too? Also, supposing that this was just a dumb acccident, without insinuating anything I would like to ask you how sure you are that the airline you work for hasn't had its share of "bad luck"?
The only thing I can tell you for sure is that when it's Ryanair, it's all over the news much sooner than the rest. Journalists are supposed to be impartial, but it's all plain politics as usual. Crews and staff aren't as attached to Ryanair, so they'll be much quicker to spread the word about each and every single incident.
Despite that, I find that it's relatively quiet relative to the size of their operation.