KAUST From United States of America, joined Jun 2009, 93 posts, RR: 26 Posted (8 years 10 months 3 weeks 4 days 13 hours ago) and read 4004 times:
I once took a flight with a CFI out of AUS (great pilot by the way!) and in a Cessna 150 (or 152.) He did the engine run-up during the taxi on the taxi-way parellel to the runway.
Is this typical? I had always though (as was always happened this way), you did the run-up either at the hold-short or in a designated pad at the runway end.
One thing I can think of is at AUS this particular taxi-way (Bravo, parellel to 17L/35R...we used to 17L, taxiing from the Trajen ramp), intersects a cross-taxi-way that an AA Mad Dog was using to pull in front of us. Perhaps we had a better chance of slipping onto the runway before them if we were ready by the time we got to the runway entrance?
"Houston, this is Apollo 8. We are now in Lunar orbit."
HaveBlue From United States of America, joined Jan 2004, 2081 posts, RR: 1 Reply 2, posted (8 years 10 months 3 weeks 4 days 11 hours ago) and read 3905 times:
Yeah, I've seen pilots do this to save time and money. Personally I prefer to do the runup on the ramp, or if that isn't practical at a hold area or while waiting in line (at DAB there is always a line), but never on the go.
AirWillie6475 From United States of America, joined Jan 2005, 2448 posts, RR: 1 Reply 3, posted (8 years 10 months 3 weeks 4 days 11 hours ago) and read 3854 times:
Engine run-up is very important and it shouldn't be done quickly so you can be the first on take off. Secondly how can he do a run-up while taxing? You have to advance the throttle to around 1800 rpm in a normal run-up.
It should be done at the designated area and it should be done at the same place always. My intructor has taught me to be repetitive in checklist items because when you break that repetition you might forget something.
Your CFI did something that was not wise. Because he did the run-up while taxing once he got up to the runway he could have forgotten checklist items like turning on the lights or the transponder or maybe flaps.
FutureUALpilot From United States of America, joined May 2000, 2591 posts, RR: 8 Reply 4, posted (8 years 10 months 3 weeks 4 days 9 hours ago) and read 3789 times:
Rolling run ups are ok to do, but it is better to stop and do them. When you throttle up you stay on the brakes....it is hard on them but it works. Sometimes its done as a time saver, others a fuel saver.
As long as you ensure you hit every checklist item, its ok to do, except being hard on the brakes.
FSPilot747 From United States of America, joined Oct 1999, 3599 posts, RR: 13 Reply 6, posted (8 years 10 months 3 weeks 4 days 2 hours ago) and read 3456 times:
I've done it on occasion at really busy airports. Saves time. If you're proficient at it, it's a piece of cake. But like I said, I've only done it at times when, like at SNA, I've had to wait 15 minutes during bank time just to get to the taxiway. Otherwise I just go to the runup area. Nothing wrong with it. In fact I learned it from an Airline pilot/former Chief CFI when we went on a 172 joyride.
N766UA From United States of America, joined Jul 1999, 8039 posts, RR: 25 Reply 7, posted (8 years 10 months 3 weeks 3 days 14 hours ago) and read 3341 times:
I'd personally never do it while taxiing. The runup has it's own spot on the checklist and is in itself very important. To do it while taxiing screws up the order of the checklist and obviously takes away from the concentration involved. I'd say it's best to do it while stopped on the pad and, except in maybe a few circumstances, I wouldn't advise doing it on the move.
Undehoulli From , joined Dec 1969, posts, RR: Reply 9, posted (8 years 10 months 3 weeks 3 days 13 hours ago) and read 3325 times:
As a CFI myself I can say that often times we're pressed for time, especially at a busy airport. I can't say that I'd ever teach a student, especially a primary student, to do a rolling runup. I can see an early learner having a difficult time controlling the airplane while it taxis, as they hold the brakes, check the mags, carb heat, etc...
I have done it with my instructor a couple of times when I was doing my instrument training. One time we were taxiing to the runway in STP and on this busy evening, we elected to do the runup and prop check during the taxi. It was nice to have two people, he taxied and I performed the runup. If I am with a student who is in the more advanced stages of training I think I'd do it to save time. It might be a bit hard on the brakes and could be dangerous (but if we accept the risk and take measures to reduce/eliminate the dangerous possible outcomes), and with two pilots at the controls I don't think that it would be a problem. On a regular basis though - I don't think so. Imagine going for a checkride and doing your runup rolling - the inspector/examiner might s&it themselves!
KAUST From United States of America, joined Jun 2009, 93 posts, RR: 26 Reply 10, posted (8 years 10 months 3 weeks 2 days 14 hours ago) and read 3200 times:
Thanks for the replies! It did seem quite odd to do a run-up in taxi (as I believe most of you had mentioned.) I had also wondered, would it not be wise to do this method in a plane as light as a Cessna 150(2) as to not risk getting airborne on the taxi-way? Also, we had just as much chance taking off before the Super 80 if we did a run-up on the hold-short, as it would be more convenient as far as wake turbulence goes?
Thanks again -
"Houston, this is Apollo 8. We are now in Lunar orbit."
GoBoeing From United States of America, joined Jun 2000, 2662 posts, RR: 15 Reply 11, posted (8 years 10 months 3 weeks 2 days 14 hours ago) and read 3199 times:
Some people were doing rolling runups in Piper Seminoles at my school and it was observed by some instructors that the breaks were being written up for not working properly about every three times a rolling runup was performed. Then someone taxiied out behind one that was running up while moving and actually saw sparks coming off of the wheels. I wouldn't do one anymore and they are not permitted unless we would be causing a disruption at some place like BOS.
Sllevin From United States of America, joined Jan 2002, 3376 posts, RR: 6 Reply 13, posted (8 years 10 months 3 weeks 2 days 12 hours ago) and read 3187 times:
I've done my fair share of rollers, especially if it's the second or third leg of the trip. It does take a bit more brake, but, OTOH, it also means less ground time, and for the most part, ground time (especially in hot climates) is tough on the engines.
I'd never counsel a pilot with limited experience to do it. But once you've got a couple thousand hours, and 500+ make/model, I don't see an issue...assuming no one is right behind you!