Domi.ga From Germany, joined Aug 2001, 34 posts, RR: 0 Posted (12 years 1 month 14 hours ago) and read 3268 times:
I've just watched an aviation video, which deals about the A320. One scene shows the thrust levers from behind and a small red switch can be seen on the lower back of the left lever. I think normally it is covered by a black cap and it seems, that there are two of these switches (one on each lever).
Rick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 50
Reply 3, posted (12 years 1 month 13 hours ago) and read 3203 times:
The switches select "BUMP" thrust, a 10% (?) thrust increase on TOGA. Helps the aircraft get out of shorter runways by increasing the PLTOW (Performance Limited Takeoff Weight). Maintenance log entry required each time it is used and a certain number of uses requires an engine overhaul / inspection I believe.
I'm not sure all versions of the A320 have the feature, Airbus drivers will correct any of the above which is not accurate I'm sure!
I used to love the smell of Jet-A in the morning...
A320-Tech From United States of America, joined Jan 2002, 38 posts, RR: 2
Reply 9, posted (12 years 3 weeks 2 days 2 hours ago) and read 2816 times:
Rick is correct. These are found on older A320s which have the original V2500-A1 engines installed (HP) and they are used for that purpose, to give a 'power boost' on take off from hot/high runways.
They are not equiped on the -A5 engines as the thrust rating is higher.