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TBO's For Airliners?  
User currently offlineCobra27 From Slovenia, joined May 2001, 1033 posts, RR: 0
Posted (7 years 2 months 2 weeks 3 days 13 hours ago) and read 5084 times:

How much time beetwen maintenance intervals for planes like 744, 777, A330, A320, B738 and how much time does it take to service these planes? Is an overnight stay enough for regular checkup? Into how many categories are they divided?
The 747 that fly around 18 hours a day must collect hours preety quickly

14 replies: All unread, jump to last
 
User currently offlineDufo From Slovenia, joined May 1999, 810 posts, RR: 4
Reply 1, posted (7 years 2 months 2 weeks 3 days 12 hours ago) and read 5088 times:

Daily checks, 10-day checks, line checks, 300-hours, 1200-hours, A-B-C-D.. it varies according to each model.

For example L410 has:
- routine maintenance A (before every flight)
- routine maintenance B (after every landing)
- routine maintenance C (after last flight of the day)
Pilots are allowed to perform A and B in this case.

- periodic check 1 (every 10 +/-1 days)
- periodic check 2 (every 300 +/- 30 hours)
- periodic check 3 (every 1200 +/- 30 hours)
- periodic check 4 (every 2400 +/- 30 hours)
- general inspection (after 4800 +/- 150 hours or latest after 10 years)
- seasonal maintenance (preparation for winter)
- unscheduled maintenance (after hard landing, landing on nose wheel, landing with bank angle greater than 10deg, leaving the runway, landing above maximum landing weight, after lighting strike).
And some other quirks Big grin



I seriously think I just creamed my pants without any influence from any outside variables.
User currently offlineCobra27 From Slovenia, joined May 2001, 1033 posts, RR: 0
Reply 2, posted (7 years 2 months 2 weeks 3 days 9 hours ago) and read 5088 times:

Is this the slovenian army L410?

User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 3, posted (7 years 2 months 2 weeks 3 days 7 hours ago) and read 5088 times:

Quoting Cobra27 (Thread starter):
How much time beetwen maintenance intervals for planes like 744, 777, A330, A320, B738 and how much time does it take to service these planes? Is an overnight stay enough for regular checkup? Into how many categories are they divided?

The only real answer is...it depends. All current production aircraft are damage-tolerant designs, so they have to have various inspections at specified intervals along with the normal servicing maintenance. However, there is no restriction on what order or what grouping you have to do those inspections and maintenance.

Each aircraft comes with a slightly different "stock" maintenance plan from the manufacturer but operators are free to design any maintenance program they wish, provided their regulators will accept it. At one extreme you have maintenance plans where the plane stays out of the hanger as long as possible, just getting line maintenance every night, then has a great big long check. At the other extreme you could hanger the plane every night and never have to bring the plane down for more than a day except for the really heavy structural inspections every few years (this is a simplification, but it's the two theoretical extremes). The former is good for airlines that don't do their own checks, the latter is good for those that have extensive in-house facilities.

Both Airbus and Boeing will help new customers design a maintenance plan that suits their operation and style.

Tom.


User currently offlineCobra27 From Slovenia, joined May 2001, 1033 posts, RR: 0
Reply 4, posted (7 years 2 months 2 weeks 2 days 18 hours ago) and read 5088 times:

Tanks Tdscanuck.
Does anybody have any info about service intervals for airline like KLM that seems to have most heavily utilized airliners in the industry?


User currently offlineFlyASAGuy2005 From United States of America, joined Sep 2007, 7004 posts, RR: 7
Reply 5, posted (7 years 2 months 2 weeks 2 days 17 hours ago) and read 5088 times:

So how oftern is an HMV done? Lets say, one of Delta's 757's. Would I be correct to say that one of their newer aircraft (T7 738, CRJ's) hasen't done an HMV yet? If so, what time frame are we looking at for that to begin.


What gets measured gets done.
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 6, posted (7 years 2 months 2 weeks 2 days 8 hours ago) and read 5088 times:

Quoting FlyASAGuy2005 (Reply 5):
So how oftern is an HMV done? Lets say, one of Delta's 757's. Would I be correct to say that one of their newer aircraft (T7 738, CRJ's) hasen't done an HMV yet? If so, what time frame are we looking at for that to begin.

I can't comment on the maintenance program for specific airlines. However, the stock 757 maintenance program is as follows:
Every flight: Transit check (aka pre-flight check)
Every 300 cycles: Structural A check
Every 500 cycles: Systems/Zonal A check
Every 3000 cycles/18 months*: Structural C check
Every 6000 cycles/18 months*: Systems/Zonal C check
Every 12000 cycles/72 months*: Structural 4C check (aka HMV, D-Check)

* = whichever occurs first.

Checks overlap so, for example, when you do a structural 4C you'd also do a systems/zonal C check.

A lot of newer 737-800's haven't hit their first heavy check yet. Not sure about the interval for CRJ's so I can't comment.

Tom.


User currently offlineDALMD88 From United States of America, joined Jul 2000, 2614 posts, RR: 14
Reply 7, posted (7 years 2 months 2 weeks 2 days 1 hour ago) and read 5088 times:

Quoting FlyASAGuy2005 (Reply 5):
So how oftern is an HMV done? Lets say, one of Delta's 757's. Would I be correct to say that one of their newer aircraft (T7 738, CRJ's) hasen't done an HMV yet? If so, what time frame are we looking at for that to begin

I think the 757 fleet is on a 6 year HMV check cycle at DL. There are PSV checks that I think fall every18 -24 months. The 777 and 738 fleets are on PSV system only. Each sucessive PSV gets more involved until the cycle is complete. Those fleets are now beginning to under go the last checks in the cycle.


User currently offlineCobra27 From Slovenia, joined May 2001, 1033 posts, RR: 0
Reply 8, posted (7 years 2 months 2 weeks 1 day 18 hours ago) and read 5088 times:

Quoting Tdscanuck (Reply 6):

I can't comment on the maintenance program for specific airlines. However, the stock 757 maintenance program is as follows:
Every flight: Transit check (aka pre-flight check)
Every 300 cycles: Structural A check
Every 500 cycles: Systems/Zonal A check
Every 3000 cycles/18 months*: Structural C check
Every 6000 cycles/18 months*: Systems/Zonal C check
Every 12000 cycles/72 months*: Structural 4C check (aka HMV, D-Check)

This is more like it.


User currently offlineDufo From Slovenia, joined May 1999, 810 posts, RR: 4
Reply 9, posted (7 years 2 months 2 weeks 1 day 18 hours ago) and read 5088 times:

Quoting Cobra27 (Reply 2):
Is this the slovenian army L410?

My data is from L410 training manual, so it is probably applicable also to L4-01! Big grin



I seriously think I just creamed my pants without any influence from any outside variables.
User currently offlineCobra27 From Slovenia, joined May 2001, 1033 posts, RR: 0
Reply 10, posted (7 years 2 months 2 weeks 1 day 15 hours ago) and read 5088 times:

what does HMV stand for?

User currently offlineDispatchguy From United States of America, joined Jan 2006, 1253 posts, RR: 2
Reply 11, posted (7 years 2 months 2 weeks 1 day 13 hours ago) and read 5088 times:

Quoting Cobra27 (Reply 10):
what does HMV stand for?

Heavy Maintenance Visit



Nobody screws you better than an airline job!
User currently offlineFlyASAGuy2005 From United States of America, joined Sep 2007, 7004 posts, RR: 7
Reply 12, posted (7 years 2 months 2 weeks 1 day 10 hours ago) and read 5088 times:

Cool! thanks guys. I don't want to get into an actual airline comment as a new subect might have to be brought up in Genreal Forum but I brought up the whole new aircraft check thing because I remember a big argument on here about how much B6's costs is going to start going up when their 320's will have to eventually do HMV.


What gets measured gets done.
User currently offlineEIDAA From Ireland, joined Oct 2006, 831 posts, RR: 16
Reply 13, posted (7 years 2 months 1 week 4 days 9 hours ago) and read 5042 times:

Quoting FlyASAGuy2005 (Reply 12):
Cool! thanks guys. I don't want to get into an actual airline comment as a new subect might have to be brought up in Genreal Forum but I brought up the whole new aircraft check thing because I remember a big argument on here about how much B6's costs is going to start going up when their 320's will have to eventually do HMV.

On the A320, the manufacturer's MPD suggests the following:-

C Check - 6,000FH / 4,500FC / 20 Mths
4C / 6Y Check - 72 Mths
8C / 12Y Check - 144 Mths

Each airline can have variations on the above, but that is a rough guide. B6 will already have carried out the first of its HMVs on the early aircraft.



Most Flown:- G-BUVA (20 Flights), EI-DEB (12 Flights), EI-JFK (11 Flights)
User currently offlineAirframeAS From United States of America, joined Feb 2004, 14150 posts, RR: 24
Reply 14, posted (7 years 2 months 4 days 14 hours ago) and read 4948 times:

When I was working at AS, our heavy maintenance checks for the 732's & 734's were for C's: every 14 months. For D's & SI's every 4-5 years. This was policy in 2000, IIRC.


A Safe Flight Begins With Quality Maintenance On The Ground.
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