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MD11 - 'Stabilizer Motion' Warning  
User currently offlineSplitzer From United Kingdom, joined Feb 2004, 151 posts, RR: 0
Posted (8 years 5 days 9 hours ago) and read 9618 times:

Just a quick question - I was watching a video of an MD11 go-around, and heard what sounded like a verbal warning of 'stablizer motion' or 'function'. Having not heard this kind of message on any previous aircraft, can someone please generally clarify on it (what the message is, why it occurs and what technical aspect of the aircraft seemingly makes it specific to the MD11).

To see the video (sound appears at 12.57min mark): http://video.google.com/videoplay?do...808482&q=aborted++takeoff%27&hl=en



8 replies: All unread, jump to last
User currently offlineFr8mech From United States of America, joined Sep 2005, 5489 posts, RR: 14
Reply 1, posted (8 years 5 days 6 hours ago) and read 9587 times:

Most, if not all, transport rated aircraft have some sort of stabilizer in motion warning. These vary from a simple clacker attached to the trim wheel (B727) to a card-in-the-bicycle-spoke type arrangement (B747 classic) to sophisticated aural warnings such is heard on the MD11.

The reason...to let the crew know that the stabilizer is moving. The warning sounds whether the stab is moved by the crew or the autopilot.

Correction: apparently the B757/B767 do not have a stab in transit warning, only an unscheduled trim warning and a loss of full rate trim warning, excluding the take-off warning system. At least I couldn't find mention if a stab in motion warning in the AMM. Perhaps I shall walk out to one of my flying pressure vessels and have a go at the controls.

[Edited 2006-10-18 06:27:53]

When seconds count...the police are minutes away.
User currently offlineOnetogo From United States of America, joined Feb 2006, 314 posts, RR: 0
Reply 2, posted (8 years 5 days 4 hours ago) and read 9546 times:

The ATR blasts a freakin ambulance siren every time the stab is in motion. You can only imagine how irritating it must get!

User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 3, posted (8 years 5 days 3 hours ago) and read 9541 times:

Quoting Fr8mech (Reply 1):
Correction: apparently the B757/B767 do not have a stab in transit warning

The 744 is the same way. You will get an EICAS caution if there is an uncommand stab trim movement, but that's it.

User currently offlineTristarsteve From Sweden, joined Nov 2005, 4023 posts, RR: 33
Reply 4, posted (8 years 4 days 21 hours ago) and read 9469 times:

The Tristar does not need such a warning.
It has a full flying tailplane. When you move the control column, the whole stabilisor moves up and down. The elevators are geared to the stabilisor and move with it.

User currently offlineCosmicCruiser From United States of America, joined Feb 2005, 2255 posts, RR: 15
Reply 5, posted (8 years 4 days 20 hours ago) and read 9462 times:

The "stabilzer motion" warning only sounds after the stab trim has been in motion for x number of seconds. It does not sound immediately upon trim movement. As posted it's to alert the crew that the trim has been moving for a few seconds and if they weren't aware now they are.

WARNING (19.0.0)
The CAWS will provide an aural warning (tone and
voice) when the horizontal stabilizer deviates one
degree or more for a given length of time. The warning
will be on until the horizontal stabilizer sensor
goes off.

User currently offlineSplitzer From United Kingdom, joined Feb 2004, 151 posts, RR: 0
Reply 6, posted (8 years 4 days 13 hours ago) and read 9399 times:

Thanks everyone for posting. Just what I wanted to know  Smile


User currently offlineNonfirm From United States of America, joined Sep 2005, 434 posts, RR: 0
Reply 7, posted (8 years 4 days 12 hours ago) and read 9384 times:

That is the same warning used in the MD-80.  airplane 

User currently offlineWSOY From , joined Dec 1969, posts, RR:
Reply 8, posted (8 years 3 days 21 hours ago) and read 9303 times:

The video actually includes no aborted takeoff, but a go-around (aborted landing) due to other traffic on the JFK runway -- so the description is wrong.

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