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Engines Run-up  
User currently offline340300 From , joined Dec 1969, posts, RR:
Posted (15 years 9 months 2 weeks 6 days 9 hours ago) and read 7564 times:

I was just reading about engine run-ups restrictions at ORD.

What is exactly an engine run-up? what purpose, characteristics, procedures, frequence...?

Thank you

10 replies: All unread, jump to last
User currently offlineJt8djet From United States of America, joined Jul 2000, 214 posts, RR: 0
Reply 1, posted (15 years 9 months 2 weeks 6 days 6 hours ago) and read 7385 times:

Engine run-ups are simply, running an engine. Maintenance will perform engine run-ups after a engine part has been changed, to verify its operating properly, or to verify a pilot discrepancy. Most of the time, engine runs are done at idle power. Idle runs can be done at the gate. but if a engine needs to be run at take-off power, then the aircraft will need to taxied to a safe spot on the airport. (I believe a 757 needs almost 2000 ft of clearance behind the aircraft to run the engine at take-off power.) Some airports have a desigated area to perform high power engine run-ups. others will have you taxi to an inactive runway.

User currently offlineAvt007 From Canada, joined Jul 2000, 2132 posts, RR: 4
Reply 2, posted (15 years 9 months 2 weeks 5 days 23 hours ago) and read 7313 times:

JT8 is right. Also, there are noise concerns. I run a/c at YVR, and we have to get permission first, where the airport authority tells us where we can do it, as well as the heading we must use to direct the noise away from the neighbours, so to speak. A"power run" takes two people of course, and involves running the engines at high power settings to test and adjust engine performance. The person in the captains seat is responsible for the running of the a/c, and the right seat guy handles the radios, and generally keeps an eye out for trouble so the first man can concentrate on his job. As for frequencies, the right seat monitors ground control, and the left seat has the company mtce frequency.

User currently offlineTwa747100 From United States of America, joined May 1999, 600 posts, RR: 0
Reply 3, posted (15 years 9 months 2 weeks 2 days 19 hours ago) and read 7268 times:

When a run up is done are the breaks put on?

User currently offlineJavelin754 From , joined Dec 1969, posts, RR:
Reply 4, posted (15 years 9 months 2 weeks 2 days 19 hours ago) and read 7268 times:

After Engine Changes, Fuel control changes, Gearbox changes, some indicating systems maintenance after heavy maintenance 'C' checks etc... as required by the Maintenance Manuals or work cards.
For multi engine heavy aircraft we use what we call the blast fence for takeoff power runup. It's a large heavy duty deflector that directs the jet blast up. The noise is still a problem, that is why there are restrictions at some airports and with most maintenance being completed on overnights it is a restraint.
One procedures is to make sure the aircraft is heavy enough not to jump the chocks. example...757-200 RB211 engines 45,000 lbs of fuel onboard minimum for take of power.
On the aircraft carrier we used a High power chain to secure the aircraft nose gear tow link to the deck and pointed the exhaust over the side.

User currently offlineTn283 From , joined Dec 1969, posts, RR:
Reply 5, posted (15 years 9 months 1 week 6 days 4 hours ago) and read 7210 times:

Our engine run practices in the USAF are almost identical. On heavies we can run at idle power on the parking spot. Must get clearance from MOCC (maintenance control) and may not be able to run after 10:00pm depending on local politicians. If we run at take-off power we take the jet to a blast fence as mentioned before. On fighters, we can run at idle-76% in the spot. If we run from 80% to full burner we either take it to the trim pad or the hush house if one is available. Both the house and the pad have tie downs for the tailhook so the jet does not jump chocks.

User currently offlineGreeneyes53787 From United States of America, joined Aug 2000, 844 posts, RR: 0
Reply 6, posted (15 years 9 months 5 days 17 hours ago) and read 7184 times:

We've almost forgotten about engine run-ups now. When I was a lad I often sat on a little block wall at the old terminal in SAN and watched lots of engine run-ups. All pre-turbine airplanes had to run-up, and still do.

Turbines are ready now!


User currently offlineL1011 From United States of America, joined May 1999, 1727 posts, RR: 8
Reply 7, posted (15 years 8 months 4 weeks 5 hours ago) and read 7159 times:

Engine run-ups were recently brought to mind when I flew on a DC-3 in Alaska. Before we took off, we sat just off the end of the runway and ran up both engines, one at a time, to full power, then back to idle. Then we proceeded to turn onto the runway for take-off. I remember doing this many years ago on DC-6, DC-7, Martin 4-0-4, and Convair 440 aircraft. Why was it necessary for piston aircraft to do this, while turboprop and jet aircraft do not?

Bob Bradley
Richmond, VA

Fly Eastern's Golden Falcon DC-7B
User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3727 posts, RR: 32
Reply 8, posted (15 years 8 months 4 weeks ago) and read 7156 times:
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The reson for the prop run up is that a 'Mag Drop' is being carried out.

Each engine has two seperate ignition systems, powered by its own magneteo. Both ign systs normally operate togther. Prior to T.O. each engine is run up to T.O. power and one ign system is switched off, a note made of the RPM, then the sys is switched back on again. The other sys is then switched off & back on. The noted RPMs are then compared with that of both sys's operating. If the RPM drop with one sys operating is outside a specific tolerance it means that system is faulty in some way and requires rectifying.

If I remember correctly when I flew Cessa 152's the mag drop had to be not more thasn 150 RPM.

A jet engine, as you will know, has self sustaining combustion once it is lit up so no similar chks are required before T.O.

User currently offlineJet-Tech From , joined Dec 1969, posts, RR:
Reply 9, posted (15 years 8 months 3 weeks 6 days 23 hours ago) and read 7148 times:

To twa747100,
Yes, the brakes, hyd. pumps and beacon light all have to be on, and should be listed in the checklist.

Jet-tech...TWA LGA !

User currently offlineAdam84 From United States of America, joined Jul 1999, 1400 posts, RR: 2
Reply 10, posted (15 years 8 months 3 weeks 5 days 13 hours ago) and read 7121 times:

When I was in IAH waiting for my flight to JAX, the plane I was to be flying on the pilot ran up the #2 engine on the 737, I know it was more than idle, They ran it up for about 3 minutes then just shut it down.

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