Pilottim747 From United States of America, joined Jul 2001, 1607 posts, RR: 5 Posted (10 years 8 months 3 weeks 5 days 19 hours ago) and read 3307 times:
I was looking at my friend's website, www.airplanephotozone.com, and I noticed a photo taken of an ERJ-145 taxiing with its thrust reversers out. This seems quite unusual. It's clearly taxiing, not landing, because MSPs Runway 30R is seen directly behind the aircraft. Has anyone spotted this before? Any ideas on why a pilot would do that (or if it was intentional)?
LVZXV From Gabon, joined Mar 2004, 2041 posts, RR: 36
Reply 1, posted (10 years 8 months 3 weeks 5 days 19 hours ago) and read 3204 times:
My guess is the pilot took one of the slipways off the runway, hasn't bled off all his speed, and is simply freewheeling i.e. making use of the speed he has so as not to use more power while taxiing. I'm sure he disengaged the reversers very shortly after this shot was taken, unless he was rolling really fast! I've seen it done before on 732s, as well as taxiing almost as far as the gate with spoilers still extended and flaps fully down. No harm done, although it is standard procedure to "clean up" once below flying speed. Once off the runway, the wheel brakes are the most effective form of braking, although reversers could be used in emergency (if taxiing in a 3rd world airport with thick fog and all of the sudden you realise your taxiway gives way to the sea or something!).
Pilottim747 From United States of America, joined Jul 2001, 1607 posts, RR: 5
Reply 2, posted (10 years 8 months 3 weeks 5 days 19 hours ago) and read 3149 times:
LVZXV, I should've mentioned that this plane is actually taxiing from the gate to takeoff. There's a photo, also on the website, that was taken maybe 30 seconds before with this plane taxing by but there are no thrust reversers out.
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NW747-400 From United States of America, joined Jun 1999, 504 posts, RR: 0
Reply 3, posted (10 years 8 months 3 weeks 5 days 18 hours ago) and read 3068 times:
I have met several biz jet pilots that use the reverse thrust to slow down during taxi...they put in power for a brisk taxi and then engage reverse thrust to slow down instead of putting wear on the brakes.
AR385 From Mexico, joined Nov 2003, 6611 posts, RR: 35
Reply 4, posted (10 years 8 months 3 weeks 5 days 18 hours ago) and read 3064 times:
If the case is what you said on reply 2, then my guess is the plane is at maximum takeoff weight, the pilot accelerated too fast and now needs to slow down, but does not want to heat the brakes as he will soon be taking off at max weight, so he is using the reversers to slow down.
RB211LTN From United Kingdom, joined Mar 2004, 133 posts, RR: 0
Reply 6, posted (10 years 8 months 3 weeks 5 days 17 hours ago) and read 2995 times:
As LVZXV mentions, I've seen this done on the 737-200. When we had then at easyJet, some of the pilots would use them at LTN when we were on the downhill run from the runway to the apron. On more than one occasion I had alarmed passengers claiming that the engine had just 'come apart'.
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Jetguy From , joined Dec 1969, posts, RR:
Reply 9, posted (10 years 8 months 3 weeks 5 days 8 hours ago) and read 2621 times:
In most, if not all bizjets, there is a pre-takeoff check that tests the thrust reversers' ability to deploy and stow. Although many AFMs call for this check prior to each flight, it is not uncommon to only see it performed on the first flight of the day. It looks like the photographer took the picture just as the flightcrew was performing the test. FYI, the test is normally performed on both T/Rs simultaneously.
In some aircraft, it is also possible to taxi with one or both T/Rs deployed to minimize the speed build-up. However, it's not always possible to do this because of deployment time and cycle limitations.