SpaceshipDC10
Topic Author
Posts: 5885
Joined: Tue Jan 01, 2013 11:44 am

Aircraft tested on shorter scheduled flights after maintenance?

Mon Jan 07, 2019 9:03 pm

A few hours ago AC A333 C-GFAF returned from QPG and landed at YYZ. Seeing that it's now on its way to YYC before resuming long-haul flights from tomorrow on (per Flightradar data), the question came to me since with the same source of data I can see that AC145 has been operated over the past seven days with an A32X and will be too from tomorrow.

Is it a way to check the aircraft in operations after it returned from maintenance, or simply a one off substitution on that flight?
 
pictues
Posts: 175
Joined: Tue Nov 09, 2004 11:41 am

Re: Aircraft tested on shorter scheduled flights after maintenance?

Mon Jan 07, 2019 11:13 pm

The flight sub is not to test for maintenance as that would be done without passengers as per law, most likely they planned this sub as the fastest way to get the aircraft back in rotation at YYC on its normal routes, or they needed more seats on that flight so would make sense to put the plane on the route, either way they make some money off the flight that may otherwise be a non rev ferry flight
 
Apprentice
Posts: 747
Joined: Sat Jan 19, 2013 12:51 pm

Re: Aircraft tested on shorter scheduled flights after maintenance?

Fri Jan 11, 2019 9:39 pm

Hi: Flight Test, requerid by Mx are only due by a short list situations, listed on company’s GMM, like
50% of engine been changed
Big incursion in Flight Control systems
Ídem in pressurization System.
In my experience, this flights are conducted with minimum Fligh Crew, instructors, with day light, and no extra personal o/b

Rgds
“An4; IL18; IL6; Tu5; D10; MD11; MD83; B32; B34: B37; B744; B748; B752; B763; B772; B773; B77W; A320; A332; A333; A342; A343.
"A NO" is a positive answer., "DON'T KNOW" is not. My Tutor (a wise man)
“CUBANA” 90 years Flying”
 
strfyr51
Posts: 3389
Joined: Tue Apr 10, 2012 5:04 pm

Re: Aircraft tested on shorter scheduled flights after maintenance?

Mon Jan 14, 2019 6:33 am

At United, Maintenance test flights are conducted under the Continuous Ferry Authorization. Setting one up is enough of a pain and might require an Engineering Crew to perform the flight. A verification flight may be accomplished by a Lines crew if NO non-normal procedures are required. United Engineering crews are not "Line Pilots" and In the past have flown B747 and DC-10 Engine out Ferry Flights. They today fly out of Overhaul Test Flights or out of Modification test flights. Ferry flights to retirement/ Storage and Many induction into fleet flights. Setting up one of those flights is a "Pain in the Butt" with all the paperwork it requires and the Approvals Needed In house and from the FAA...
 
SpaceshipDC10
Topic Author
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Joined: Tue Jan 01, 2013 11:44 am

Re: Aircraft tested on shorter scheduled flights after maintenance?

Mon Jan 14, 2019 11:14 am

Thanks all for your explanations.
 
citationjet
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Joined: Sun Mar 09, 2003 2:26 am

Re: Aircraft tested on shorter scheduled flights after maintenance?

Tue Jan 15, 2019 2:38 am

I remember back in the 1970s, I was non-revving a Braniff 747 from DFW to London. There was a problem with the #1 engine that was discovered at the gate, which required an engine change. The engine change was done at the gate, and was watched by all the waiting passengers. The process took 5 hours to change engines. After the new engine was installed, the plane was taxied to a run up pad and the engine was run. It then taxied back to the gate, everyone boarded the aircraft and off we went to London.

A few years later, a TWA 747 flight I was on out of ORD needed an engine change. This time the engine change was performed in TWA's hanger. Five hours later the plane showed up at the gate, and off to Europe we went.
Boeing Flown: 701,702,703;717;720;721,722;731,732,733,734,735,737,738,739;741,742,743,744,747SP;752,753;762,763;772,773.
 
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Balerit
Posts: 606
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Re: Aircraft tested on shorter scheduled flights after maintenance?

Wed Jan 23, 2019 2:43 pm

citationjet wrote:
I remember back in the 1970s, I was non-revving a Braniff 747 from DFW to London. There was a problem with the #1 engine that was discovered at the gate, which required an engine change. The engine change was done at the gate, and was watched by all the waiting passengers. The process took 5 hours to change engines. After the new engine was installed, the plane was taxied to a run up pad and the engine was run. It then taxied back to the gate, everyone boarded the aircraft and off we went to London.

A few years later, a TWA 747 flight I was on out of ORD needed an engine change. This time the engine change was performed in TWA's hanger. Five hours later the plane showed up at the gate, and off to Europe we went.


Yip, that's how we operated as well. Single engine change just needed an engine run to record all the parameters at start up and take off power and that the thrust reverser operated okay. Not sure what they do these days. Sometimes an engine would require the FCU to be trimmed and that would take a few hours.

After major overhaul test flight was required if 50% of the engines were removed and refitted, any flight control surface changed or any pressurization issues to be checked.
Licensed Aircraft Maintenance Engineer (retired).
 
strfyr51
Posts: 3389
Joined: Tue Apr 10, 2012 5:04 pm

Re: Aircraft tested on shorter scheduled flights after maintenance?

Thu Jan 24, 2019 2:33 am

citationjet wrote:
I remember back in the 1970s, I was non-revving a Braniff 747 from DFW to London. There was a problem with the #1 engine that was discovered at the gate, which required an engine change. The engine change was done at the gate, and was watched by all the waiting passengers. The process took 5 hours to change engines. After the new engine was installed, the plane was taxied to a run up pad and the engine was run. It then taxied back to the gate, everyone boarded the aircraft and off we went to London.

A few years later, a TWA 747 flight I was on out of ORD needed an engine change. This time the engine change was performed in TWA's hanger. Five hours later the plane showed up at the gate, and off to Europe we went.

Some Years ago I was a Maintenance foreman at United At SFOMM. We had a B727 come in with the #3 engine failed and shut down. I didn't have a spare airplane but I did have a ready engine built for the #3 position. So? I thought it would be ok to fix the airplane on the Gate if I shut down the Ajacent gate to the right. The ops boss agreed with me as I assured him I could have the airplane back in service in a little over an Hour. So? I got my troops together, Got the Equipment staged and as soon as the bags and cargo were offloaded we got busy and removed the engine, Inspected the firewall and swung the new engine up in under 65 minutes.
I almost got FIRED!! The VP of Maintenance, My Maintenance operating Manager (General Foreman) , My shift Manager and the VP of Inspection all got Pissed at me for doing the engine change on the Gate. But not ONE of them could come up with a reason WHY NOT?? I had the ok from the OPS Boss, the Station Manager (also a VP) AND the Flight duty Manager. Because I consulted them ALL before I ldid it!! They were hacked off because I did it in front of Passengers. Well? The outbound Passengers weren't hacked off because they got to leave 2 hours before the replacement airplane was supposed to arrive from Denver. Just the same?
I was never alowed to do it ever again.. I found out later they were Hacked off because I didn't consult them. (I didn't have time and they were already in a meeting.)
 
737mxguy
Posts: 4
Joined: Fri Jan 19, 2018 7:03 pm

Re: Aircraft tested on shorter scheduled flights after maintenance?

Thu Jan 24, 2019 3:00 pm

There is one scenerio that would be a exception that I believe everyone is missing. If a ETOPS system had been worked on or disturbed that required a ETOPS verification flight instead of scheduling a test flight with a empty plane they could schedule it to operate a non ETOPS route(s) until which it could be recertified back at ETOPS worthy.
 
7673mech
Posts: 511
Joined: Tue Mar 30, 2004 10:10 am

Re: Aircraft tested on shorter scheduled flights after maintenance?

Fri Jan 25, 2019 4:51 am

737mxguy wrote:
There is one scenerio that would be a exception that I believe everyone is missing. If a ETOPS system had been worked on or disturbed that required a ETOPS verification flight instead of scheduling a test flight with a empty plane they could schedule it to operate a non ETOPS route(s) until which it could be recertified back at ETOPS worthy.


Mature ETOPs programs allow for the verification flight to be conducted on the first hour of a revenue flight. If the system works, flight continues, if it fails need to return. The Pacific based airlines sometimes can't fly no ETOPs, so after the verification period MOC releases the flight to continue over ocean.
 
737mxguy
Posts: 4
Joined: Fri Jan 19, 2018 7:03 pm

Re: Aircraft tested on shorter scheduled flights after maintenance?

Fri Jan 25, 2019 9:25 am

7673mech wrote:
737mxguy wrote:
There is one scenerio that would be a exception that I believe everyone is missing. If a ETOPS system had been worked on or disturbed that required a ETOPS verification flight instead of scheduling a test flight with a empty plane they could schedule it to operate a non ETOPS route(s) until which it could be recertified back at ETOPS worthy.


Mature ETOPs programs allow for the verification flight to be conducted on the first hour of a revenue flight. If the system works, flight continues, if it fails need to return. The Pacific based airlines sometimes can't fly no ETOPs, so after the verification period MOC releases the flight to continue over ocean.


More or less what I was getting at.

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