"Elevator Trim" on 747-100

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25th July 2002 | 17:24

#1 (permalink)

CCA

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Joined: Oct 1999

Posts: 206

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From: Up there

"Elevator Trim" on 747-100

Just found an old photo of a Polar -100 and on the center pedestal (P8) at the rear left, fwd of the aileron trim switches there is a elevator trim gauge, don't think it was functioning though.
Any Ideas on it's obvious function as there were no trim switches and I don't remember being able to trim the elevators.
Plus unrelated to elevator position indicator.

25th July 2002 | 23:06

#2 (permalink)

18-Wheeler

Joined: Jul 2001

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From: Gold Coast

Sure it's not an old EPR ssytem of some sort? That's where the test system & panel for some of them normally sits.

26th July 2002 | 08:49

#3 (permalink)

CCA

Thread Starter

Joined: Oct 1999

Posts: 206

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From: Up there

Nuh it Says " elevator trim" and has +2/-2 units.

26th July 2002 | 13:58

#4 (permalink)

18-Wheeler

Joined: Jul 2001

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From: Gold Coast

*scratches head* ...
Nah, sorry, don't know!
I've flown a few -100's (all ex-JAL) and none of them had anything like that.

27th July 2002 | 17:13

#5 (permalink)

Zoner

Joined: May 2001

Posts: 180

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From: Area 52

Pan Am aircraft had these. They were originally used in conjunction with the INS for fuel savings on long haul flights. On the INS you would select Wind/Hold and it would then show acceleration/deceleration in milli-Gs; you could then use the trim and the throttles to maintain zero elevator displacement and constant speed throughout the the flight. A poor man's PMS I guess.