PPRuNe Forums - View Single Post - Check Flights and Pulling Circuit Breakers
Old 30th Jan 2021, 06:04
  #14 (permalink)  
ExSp33db1rd
 
Join Date: Jan 2008
Location: The Smaller Antipode
Age: 89
Posts: 31
Received 17 Likes on 10 Posts
Early BOAC days of the "real" Boeing 707 - i.e. not the simulator at that time, the Stabiliser Runaway drill was to shout "Runaway Stabiliser" then first stop the rapidly turning wheel situated on the sides of the centre console, maybe breaking a finger nail, or even a wrist (!) in the process, cut the adjacent switches on the console, and call for the circuit breaker situated on the overhead panel to be pulled by the Flt. Eng. then raise the handles stowed in the wheels and manually re-trim by hand.

At around 5,000 ft over the Severn Estuary the Trg.Capt. ran the stabiliser nose down. The trainee co-pilot stopped the wheel, cut the switches and called for the CB to be pulled. " Very Good, now recover" said the Trg. Capt. The trainee pulled back on the control column to try to reduce the rate of descent, re-engaged the switches, and called for the CB to be re-set, but .... pulling back on the column was creating so much "G" force that the Flt. Eng. couldn't raise his hand high enough to reach the CB. By now the aircraft was seriously descending, and the force over the stabiliser was such that both pilots together were unable to turn the wheel with the manual handles, of course the answer would have been to momentarily push further forward to relieve the load, and then wind back but with the ocean rapidly filling the windscreen, who would ? Eventually, with the Flt.Eng. bracing his feet against the forward panel, and a hand on each control column, all three managed to pull hard enough to stop the descent - about 500 ft above the water apparently.

Following that CB's were not pulled, until the simulator sessions took over.

Murphy is always with us.
ExSp33db1rd is offline