Jettime B738 at Billund and Copenhagen on Dec 21st 2023, flaps failure and landing below minimum fuel

Last Update: June 25, 2024 / 17:18:05 GMT/Zulu time

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Incident Facts

Date of incident
Dec 21, 2023

Classification
Report

Airline
Jettime

Flight number
JP-546

Destination
Billund, Denmark

Aircraft Registration
OY-JZN

Aircraft Type
Boeing 737-800

ICAO Type Designator
B738

A Jettime Boeing 737-800, registration OY-JZN performing flight JP-546 from Hurghada (Egypt) to Billund (Denmark) with 178 passengers and 7 crew, was on a final ILS approach to Billund's runway 27 with gear and flaps in position when the EGPWS sounded a windshear alert at 300 feet AGL prompting the crew to initiate a go around. While climbing through 725 feet AGL the crew noticed a flaps disagree message with the flaps lever set to 15 degrees and the flaps indicating 13 degrees, the flaps became locked. After working the flap related checklist the crew decided to divert to Copenhagen, requested to climb to FL180 and priority for landing on Copenhagen's runway 30. Enroute to Copenhagen the crew declared Mayday due to low fuel and continued for a safe landing on Copenhagen's runway 30 in gusting winds. The aircraft landed about 119 kg of fuel below the required minimum of 1118 kg of fuel.

Denmark's Havarikommissionen released their final report concluding the probable causes of the serious incident were:

Following a missed approach due to windshear at the destination aerodrome, a flap overspeed occurred during initial climb-out.

The FSEU commanded an automatic flap retraction while the flight crew simultaneously moved the flap handle to position 15°. A flap solenoid valve failed to reset, and the FSEU removed power to the flap drive system, when the flaps were retracting at position 13°.

Due to the weather conditions, the flight crew decided to divert to the destination alternate aerodrome.

The increased fuel consumption due to the flap 13° non-normal aircraft configuration reduced landing fuel to less than the required minimum final reserve.

The flight crew declared a fuel emergency leading to ATC priority and direct routing.

The aircraft landed with 119 kg)/(three minutes) less than the required minimum final reserve fuel of 1,118 kg/(30 minutes).

The HCL analysed:

The aircraft landed in EKCH with 999 kg/27 minutes of remaining fuel. The remaining fuel was 119 kg/three minutes less than the required minimum final reserve fuel according to the operator OM-A and EASA regulations.

Throughout the flight, the flight crew focused on the fuel consumption and the weather conditions and acted proactively when the circumstances changed.

After the missed approach in EKBI, and had it not been for the unexpected stuck flap situation, the aircraft would have landed in EKCH with more than the required minimum final reserve fuel.

As the situation evolved, suitable alternate aerodromes and remaining fuel were limited, leaving the flight crew with few options other than divert to EKCH and declare a fuel emergency.

ATC priority mitigated the consequences but could not prevent a landing with less than the required minimum final reserve fuel.

The flight crew opted not to go beyond the non-normal checklist and attempt to retract the flaps in order to reduce the unexpectedly increased fuel consumption. This is an option available to any commander if deemed necessary for flight safety reasons. Considering the quantity of the fuel shortage versus any possible unexpected consequences of going beyond the checklist, the AIB considers the decision to be rational.
Incident Facts

Date of incident
Dec 21, 2023

Classification
Report

Airline
Jettime

Flight number
JP-546

Destination
Billund, Denmark

Aircraft Registration
OY-JZN

Aircraft Type
Boeing 737-800

ICAO Type Designator
B738

This article is published under license from Avherald.com. © of text by Avherald.com.
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