Forum: F-16 Procedures

I’m amazed at the amount of people either aircrew or ground technicians that don’t hold the brakes during scavenge shutdown, bleed air mode check, SEC, etc … solely rely on the chocks? (Wheel blocks)

Kinda silly don’t you think? Hell, I don’t even think the run book tells you to hold the brakes?

I just don't want anyone to get run over Sad

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I dont know about anyone else but I ALWAYS held brakes for anything over idle. It only takes one auto-accel to imprint that firmly in your mind!

I have to hold brakes above idle, just don't feel comfortable not doing it. When I have run high power in the Hush House I felt odd not holding them.

Around Jun of 94 my jet 90-0794 broke loose in AB in the hush house at Moody. Run guy was on the brakes noticed the overhead lights moving realized it had let go, jerked it to cut off selected NWS and steered it at bit. Poked a hole in the house house door, bent pitot tube back against radome. The medal was already written until it was discovered the cause was my asst (I was on leave) was unfamilier with how the tie-down works. He hooked the hook to the pin that holds it in the collar. Run guy never checked it, oops. Was at home and Pastorious stops by my place with a "dude, yer never gonna believe this" stories.

The times I've seen "Chock Jumping", it was always pilots in a hurry and it was always with the little chocks.

I always check my brakes before i do any run over idle but as long as my parking brake is set for the time, i never hold the brakes. I remember holding the brake the first time i did a aug run for my cert. But that was is.

During a run in '91, a newly trained run-up guy, had trouble reaching the engine switches under the throttle in a block 15 model.
Instead of moving around the throttle, he moved it out of the 'off'-position forward to the stop (full mil.).
After the JFS had done it's job we noticed the nozzle closed real fast and the AC moved forward in a rapid [Link pending approval]

Weird thing [Link pending approval],the chocks weren't 'jumped', they remained under the main wheels as the wheel (and aircraft) went forward (not rotating).
After the throttle was put back in the 'off'-position (after three seconds, seemed like three hours) and our shorts were changed, we found the (wood)chocks worn down to half their original size, the tires had very deep bold spots on them and the hangar seemed a lot closer than before (we were running outside).

There were also two wood splinter/rubber tracks on the ramp.
Hard to hide from the powers that [Link pending approval]

Mushmouth wrote:

I always check my brakes before i do any run over idle but as long as my parking brake is set for the time, i never hold the brakes. I remember holding the brake the first time i did a aug run for my cert. But that was is.

Parking brake at idle, yes. But I hope you are not relying on your parking brake for above idle situations. The parking brake automatically releases when the throttle is advanced past idle.

thals1kid wrote:

Mushmouth wrote:

I always check my brakes before i do any run over idle but as long as my parking brake is set for the time, i never hold the brakes. I remember holding the brake the first time i did a aug run for my cert. But that was is.

Parking brake at idle, yes. But I hope you are not relying on your parking brake for above idle situations. The parking brake automatically releases when the throttle is advanced past idle.

Can't speak for GE's but on Pratts the Parking Brake goes off around 75%. There is some room to work with the Parking Brake.

I remember catching myself straining to hold brakes whenever I pushed the throttle forward Two Cents

Dudes, ya can't tell by RPM when the parking brake will fall off, the P.B. will come off when the trottle is 1 inch to 1and 1/4 inch from idle. Now I have been at 80% with a full internal load of gas without P.B. Seen a guy hit min aug with full internal in a small mouth 30, jet didn't move but he wasn't in aug very long either! Jets on ice is always fun to watch, saw this at Osan in 85, pilot freaked out I just said I'm o.k. your on cement now so your good. I've never jumped chocks, but I'm ready for it!

I held brakes anytime I ran engines. I never trusted the Parking Brake, for some reason, the hairs on my neck just felt odd (not applying pressure) so I always applied brake pressure....I never had an incedent jumping chocks (thank goodness), sometimes being a bid more careful just pays off in the long run.

I have never had the Parking Brake switch off before 73% or after 76 %. When I am running I am paying attention to the gauges not if throttle has traveled an 1" to 1 and 1/4". If it's kicking off early or above that you might have a problem with the TPS, MFC, or rig. Like I said earlier though I can only speak for Pratts.

I've been in jets (30's 40's 50's) where the pb didn't come off until 82%, depends on temperature atmospheric pressure and some other stuff on idle rpm and how much rpm you'll get from any said engine. The PW motors idle a little lower rpm than GE,as a general rule of thumb, there are obviously exceptions. The PW usually has the pb off way before hitting low stage on the ecs system. Isn't running jets just a frickin blast!

Yes, it was (I don't anymore) but I loved it, especially bing tied down, going augmenter....what a rush

Forum: F-16 Procedures

Anybody ever “jump” chocks?