PPRuNe Forums - View Single Post - B747-400 no stick pusher
View Single Post
Old 5th Apr 2007, 10:04
  #15 (permalink)  
spannersatcx
 
Join Date: Dec 1998
Location: .
Posts: 2,997
Likes: 0
Received 0 Likes on 0 Posts
Cool

That's news to me. The classic does not have a stick nudger/pusher. It has a stick shaker motor mounted on the capt's control column which is activated by a signal from the stall warning computer. A torque tube interconnecting the two control columns transfers vibration from the captain's control column to the first officers control column.
If you read AMM chapter 27-32-00 it states:
C. With trailing edge flaps full up, activation of the control column shaker automatically energizes a stick nudger which moves the control column forward to alleviate the approaching stall condition. The stick nudger installation consists of a control column actuator, a relay, and
connections to inboard and outboard flap switches. When both flap
switches indicate flaps up, the stick nudger relay is energized by the
same warning computer output which shakes the control columns.
When ever you do the stall warning test you get the control column shaking and it also pushes forward. Sounds like a stick pusher to me.

It also has a shaker on each comtrol column:

The control column shakers vibrate the control columns when energized by
a signal from either stall warning computer. A shaker is clamped to the
front of each pilot's control column.
Each shaker consists of a motor
and a coaxially mounted weighted ring. Energizing the motor rotates the
out-of-balance ring, and the resulting vibration shakes the control
columns.
spannersatcx is offline