Boysteve From United Kingdom, joined Apr 2004, 937 posts, RR: 0 Posted (7 years 4 months 3 weeks 4 days 2 hours ago) and read 3707 times:
Does anyone have any information regarding aircraft utilization across a fleet. For example, I know that BA has 50 something B744's but how many are required to be available at any one time in order to operate its normal schedule? How often would an aircraft be in maintenance as opposed to in revenue earning service? Is it 1 day per week, 1 day per 2 weeks etc? Do larger airlines have any spare aircraft to recover from delays these days? Thanks.
Oly720man From United Kingdom, joined May 2004, 6698 posts, RR: 11
Reply 1, posted (7 years 4 months 3 weeks 2 days 23 hours ago) and read 3558 times:
Aircraft will inevitably have maintenance checks (A, B, C, D) as well as tyre changes and other more minor checks. The standard C-D checks involve hangar time and will be scheduled by the airline in advance and the other checks can be done at the gate or on stand overnight.
Most airlines will have more aircraft than routes and there will be some spare capacity. In the worst case, too many poorly aircraft, or too many routes, aircraft will be leased in. E.g. BMI and their Arkefly B767 and FI B757. BMI once had a UA B767 fly into MAN from ORD after an A330 went tech.
An example on utilisation is the BA B767 that does the MAN-JFK route and can do so for weeks or months, if not years on end before being rotated with another LHR aircraft. Presently BNWT since 19th Feb. Before that BNWN from 19 Jan, 'WM from 24 Nov, 'WW from 28th Sept. The BA 767s have being going through a cabin upgrade so there's been more of a change in the aircraft on the route than in the past, e.g. in 2003-2005 when 'WH did the route pretty well all the time.
Narrowbody "C" Checks
American does two types of "C" checks on its narrowbody planes. The first is a "Light C" check, which occurs approximately once a year. It requires approximately 2,100 man-hours and three days to accomplish. Every fourth "Light C" check becomes a "Heavy C" check. This check requires 20,000 - 30,000 man-hours and takes from three to five weeks to accomplish.
Widebody "C" Checks
Because of the complexity of widebody aircraft, all "C" checks are "Heavy C" checks. The complete airframe inspection and service is done every 15 - 18 months. It takes approximately 10,000 man-hours and from two to four weeks to accomplish a widebody "C" check.