User avatar
Faro
Posts: 1494
Joined: Sun Aug 12, 2007 1:08 am

Take-Off Abandoned On Power-On

Thu Dec 02, 2010 10:40 am

Recently on a 738 flight flight from GVA, the take-off was aborted practically 1-2 seconds after full T/O thrust was set. The aircraft then braked gently and exited from the first taxiway and headed directly back to the T/O holding point. It then took off normally; the flight to destination was uneventful.

My question is besides faulty/spurious warning lights/indicators, what could have produced such a abort? Without the benefit of hindsight, could the decision to directly proceed to T/O after the mini-abort have been warranted?

Faro
The chalice not my son
 
Dogbreath
Posts: 172
Joined: Fri Mar 28, 2008 8:49 am

RE: Take-Off Abandoned On Power-On

Thu Dec 02, 2010 11:45 am

There can be a great deal of reasons for a rejected T/O. In your case it was a low speed reject and could have been one of the following:

1. Beginning the T/O without an T/O clearance.
2. ATC cancels the T/O clearance due any number of reasons.
3. Birds sighted on the runway or T/O flight path.
4. Predictive Windshear Warning.
5. T/O configuration warning horns sounds.

These are just a few examples, and I'm sure others may be able to add further reasons.

The fact that the crew taxied back for a normal T/O indicates to me that the reason was rectified without any problems and the remainder of the flight was presumably operated normally.
Truth, Honour, Loyalty
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Take-Off Abandoned On Power-On

Fri Dec 03, 2010 3:33 am

Quoting faro (Thread starter):
Without the benefit of hindsight, could the decision to directly proceed to T/O after the mini-abort have been warranted?

Do you mean proceed directly to a T/O without leaving the runway, or do you mean going ahead to takeoff after looping back around to the beginning of the runway?

The former would not be acceptable, since it would invalidate all your performance calculations and takeoff procedures. The latter would be fine, provided that the reason for the "min-abort" was no longer present.

Tom.
 
User avatar
Faro
Posts: 1494
Joined: Sun Aug 12, 2007 1:08 am

RE: Take-Off Abandoned On Power-On

Fri Dec 03, 2010 8:42 am

Quoting tdscanuck (Reply 2):
Do you mean proceed directly to a T/O without leaving the runway, or do you mean going ahead to takeoff after looping back around to the beginning of the runway?

Yes, it was a loop-back rerun of the T/O.

Faro
The chalice not my son
 
lax25r
Posts: 23
Joined: Mon May 12, 2008 2:41 am

RE: Take-Off Abandoned On Power-On

Sun Dec 05, 2010 10:25 pm

I've seen this type of aborted takeoff at San Francisco a couple of times a day. San Francisco's runways intersect, and ATC usually departs aircraft off the 1L and 1R and lands 28L and 28R. The abort usually goes something like this:

1) ATC clears an aircraft to takeoff of runway 1L or 1R with an aircraft on a 2-3 mile final for one of the 28s.
2) The departing aircraft doesn't start their takeoff roll right away and instead waits a few seconds.
3) By the time they've just applied takeoff power, the aircraft on final to the intersecting runway is now too close, and ATC cancels the takeoff clearance for the aircraft departing the 1s.
 
Spacepope
Posts: 3153
Joined: Tue Dec 28, 1999 11:10 am

RE: Take-Off Abandoned On Power-On

Mon Dec 06, 2010 12:17 am

Had this happen on a UA 744 flying ICN-SFO. Accelerated to 45mph on the runway then turned off back onto the taxiway. Pilots claimed some paperwork issue for maint. stuff. Flight was slightly delayed from the get go for repairs.
The last of the famous international playboys
 
bohica
Posts: 2304
Joined: Tue Feb 10, 2004 3:21 pm

RE: Take-Off Abandoned On Power-On

Mon Dec 06, 2010 2:48 am

I was on a UA flight one time listening to channel 9 during taxi-out and one of the planes ahead of us aborted takeoff. The UA plane announced its abort to the tower and the tower asked if the plane needed any assistance. The crew replied in the negative saying the F/O's window was left open. Oops.  
 
b78710
Posts: 311
Joined: Fri Mar 24, 2006 4:21 am

RE: Take-Off Abandoned On Power-On

Mon Dec 06, 2010 9:37 am

could have been a config warning which will not appear until take off power is selected.

Who is online

Users browsing this forum: Horstroad and 12 guests