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Vietjet A321 at Da Nang on Apr 11th 2018, both engines stalled

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Vietjet A321 at Da Nang on Apr 11th 2018, both engines stalled

Old 13th Apr 2018, 08:34
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Vietjet A321 at Da Nang on Apr 11th 2018, both engines stalled

Accident: Vietjet A321 at Da Nang on Apr 11th 2018, both engines stalled, both engines EGT overtemperature, one engine shut down in flight, electrical problems

By Simon Hradecky, created Thursday, Apr 12th 2018 20:07Z, last updated Thursday, Apr 12th 2018 21:31Z

A Vietjet Airbus A321-200, registration VN-A651 performing flight VJ-627 from Da Nang to Ho Chi Minh City (Vietnam), was in the initial climb out of Da Nang's runway 35L when both engines (CFM56) showed EGT OVERTEMPERATURE warnings prompting the crew to stop the climb at 4000 feet and to return to Da Nang, the left hand engine stalled, the EGT overtemperature indications continued, the right hand engine stalled, both engines continued to show EGT overtemperature indications. The left hand engine was shut down 2 minutes after the first indications, the crew received an AC essential bus fault, a DC Bus 1 fault indication and a fuel inerting system fault. The aircraft managed to land safely on Da Nang's runway 35R about 15 minutes after departure.
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Old 13th Apr 2018, 09:02
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Soo, which common mode failure could cause that? I cant even think of anything. Fuel?
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Old 13th Apr 2018, 10:29
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Originally Posted by sandos View Post
Soo, which common mode failure could cause that? I cant even think of anything. Fuel?
there was some mention of bird strikes on a previous flight...the electrics anyone's guess
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Old 13th Apr 2018, 14:12
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two engines showing the same fault. seems strange to shut down one putting more strain on the other.

idling or reducing the engine with higher EGT i could understand better.
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Old 13th Apr 2018, 14:29
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Reducing one to idle to reduce EGT sounds pretty reasonable to me......still keep the ancillaries and if the other starts to misbehave (more) you’ve at least got something. Pretty nasty position to be in.....going to be an interesting report.

A4
(10000+ HRs Airbus. Not a Sky God)

Update -
Previous comment has been removed by poster....which essentially rubbished wiedehopf’s opinion in post #4 accusing them of inexperience and being a Sky God who knows nothing......

4

Last edited by A4; 14th Apr 2018 at 07:04.
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Old 13th Apr 2018, 14:47
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Soo, which common mode failure could cause that? I cant even think of anything. Fuel?
no fuel = No EGT

High EGT often means poor compressor output,

Common cause could be compressor damage or worn turbine. Engines will often still be able to run at idle if not severely damaged.
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Old 13th Apr 2018, 17:35
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We have a temporary DU for "Multiple Undue ECAM Alerts" for some of our A320 fleet, which lists EGT overlimit as one of the alerts. There's also an issue where a failing wiring harness or generator can trigger a long list of spurious alerts and warnings as the voltage fluctuates but isn't detected by the GCU.

I've had that one, it's *really* confusing. Doesn't help if it's engine one either as you can lose the captain's ACP and VHF1.

Wonder if it's related to this?
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Old 14th Apr 2018, 04:14
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Word on the street is that it had a serious birdstrike (enough to replace the radome) but engines were assessed as undamaged.

Good job to get it back on the ground, it will be interesting to see a full report.

One would think that any existing damage to the engines would manifest itself once takeoff power was set, but stranger things have happened.
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Old 16th Apr 2018, 00:59
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Originally Posted by MajorLemond View Post
Word on the street is that it had a serious birdstrike (enough to replace the radome) but engines were assessed as undamaged.

Good job to get it back on the ground, it will be interesting to see a full report.

One would think that any existing damage to the engines would manifest itself once takeoff power was set, but stranger things have happened.
Sort of thinking out loud here, but one possible explanation is difference in air density at runway altitude versus 3 or 4 minutes into climbout. If the compressors were damaged the performance falloff very well might be greater in low air densities and the fans begin to spin at higher rpm's to maintain necessary air flow at higher altitudes and speeds.

Pilots might only notice takeoff run taking more runway than it should have for a particular flex setting. Then as climb performance is not as expected they might override and then the extra fuel make EGT matters worse.
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