Re: The Fokker Aircraft
Date: April 15, 2005 02:21PM
Couldn't help but notice. After several years of maintaining an FH-227 for the University of Florida, I have a pretty good knowledge of the systems. The answer to number three is yes, all pneumatic lock, and unlock, a function of the first portion of travel of the retract cylinder unlocked, and conversely, the last portion of travel locked it down. The pressure came from a pair of Roots blowers mounted one each on the accessory gear boxes, and was stored in a high pressure bottle, with an emergency bottle as back up. The steering was all pneumatic also. Once the bottle was pressurized, I could get about 3 or 4 retracts out of it before having to reservice by either a ground unit, or running an engine. The system was prone to slow leaks, and sometimes when sitting on the ramp for extended periods, we'd have to chock up the wheels, and run an engine to refill the bottles. The brakes were also pneumatic (with its own bottle), and as such, would suddenly start rolling when an engine was cranked up - no steering, no brakes!
Since we got rid of the old bird, I sleep better now. I'm sure the folks at Piedmont in Winston-Salem do too, they used to perform the heavy maintenance every year. 227's aren't very maintenance friendly.