boysteve
Posts: 887
Joined: Sun Apr 25, 2004 7:02 am

Aircraft Utilization & Maintenance

Mon Apr 02, 2007 4:55 am

Hi Everyone,

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
Posts: 5760
Joined: Fri May 21, 2004 7:13 am

RE: Aircraft Utilization & Maintenance

Tue Apr 03, 2007 7:00 am

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.

http://en.wikipedia.org/wiki/Aircraft_maintenance_checks

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.
wheat and dairy can screw up your brain
 
boysteve
Posts: 887
Joined: Sun Apr 25, 2004 7:02 am

RE: Aircraft Utilization & Maintenance

Tue Apr 03, 2007 7:15 am

Quoting Oly720man (Reply 1):
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.

Thanks for that, and the web link. So how long would a C or D check typically render an aircraft inoperable?
 
oly720man
Posts: 5760
Joined: Fri May 21, 2004 7:13 am

RE: Aircraft Utilization & Maintenance

Tue Apr 03, 2007 7:31 am

A 'D check' can take a month at least for a B747. The plane is basically reduced to its major components, all seats and internal fittings removed, etc.

http://www.aerospace-technology.com/...actors/maintenance/klm/press7.html


http://www.aa.com/content/amrcorp/co...orateInformation/facts/fleet.jhtml

American only go up to C checks it would appear.

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.
wheat and dairy can screw up your brain

Who is online

Users browsing this forum: CanadianNorth, Google [Bot], TZTriStar500 and 16 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos