Yamal A320 at Moscow on Jan 14th 2021, unreliable airspeed

Last Update: February 12, 2021 / 19:02:04 GMT/Zulu time

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Incident Facts

Date of incident
Jan 14, 2021

Classification
Incident

Flight number
YC-32

Aircraft Registration
VP-BBN

Aircraft Type
Airbus A320

ICAO Type Designator
A320

A Yamal Airlines Airbus A320-200, registration VP-BBN performing flight YC-32 from Moscow Domodedovo to Salekhard (Russia) with 111 people on board, was climbing through FL220 out of Domodedovo's runway 14R when the crew stopped the climb reporting unreliable airspeed, descended to FL150 maintaining FL150 with deviations of up to +/- 200 feet for 70 mimutes. The crew subsequently performed an approach to Domodedovo's runway 14R but went around from about 1700 feet about 2 hours after departure. The aircraft climbed to FL170 (with deviations of -150 to +600 feet) and set course to St. Petersburg (Russia) and landed safely on St. Petersburg's runway 10R about 90 minutes after the go around and about 3.5 hours after departure.

The Novourengoy Transport Prosecution Office reported the aircraft diverted to St. Petersburg due to technical reasons, the aircraft landed in normal mode. A safety check has been initiated.

Rosaviatsia reported the crew declared emergency and reported they had lost all airspeed information and assumed the pitot probes had been frozen over. They were tracking their speed (over ground) with the GPS only. They decided to return to Domodedovo and on subsequent recommendation by their dispatcher decided to divert to St. Petersburg, ATC agreed to provide the shortest route to St. Petersburg and a visual approach into St. Petersburg.

On Feb 12th 2021 Rosaviatsia reported that both captain and first officer lost their speed indications on the primary flight displays associated with the autopilot disconnecting. The commander decided to divert to St. Petersburg where the aircraft landed safely. Both ADR1 and ADR2 suffered the loss of total pressure due to corrosion on the contacts of the ADM-L and ADM-R block plugs. Rosaviatsia issued the recommendation to perform functional and accuracy tests of the ADMs with pitot and static test sets at least at intervals of 48 months (4 years).

Metars Domodedovo:
UUDD 140300Z 08006MPS 060V120 3900 -SN OVC026 M13/M16 Q1005 RESN R14R/490337 TEMPO 1000 SHSN BLSN BKN012CB
UUDD 140230Z 07005MPS 050V110 0650 0600E R14R/1500N +SN VV008 M13/M15 Q1005 R14R/490337 NOSIG
UUDD 140200Z 08006MPS 050V120 0700 R14R/1800D +SN VV009 M13/M15 Q1005 R14R/490337 NOSIG
UUDD 140130Z 09006MPS 060V120 0900 R14R/2000U +SN VV010 M13/M15 Q1006 R14R/490337 NOSIG
UUDD 140100Z 09005MPS 1000 R14R/1900 SN VV009 M13/M15 Q1006 WS R14R R14R/490337 NOSIG
UUDD 140030Z 09006MPS 1100 R14R/2000 SN OVC010 M13/M15 Q1006 REBLSN R14R/490337 NOSIG
UUDD 140000Z 09007MPS 060V120 1200 1100N R14R/P2000 SN OVC019 M13/M15 Q1007 REBLSN R14R/490337 NOSIG
UDD 132330Z 08006MPS 1300 1200SW R14R/P2000 SN OVC007 M12/M15 Q1007 R14R/490337 NOSIG
UUDD 132300Z 09006MPS 060V120 1000 R14R/1900 SN OVC011 M12/M15 Q1008 R14R/490337 NOSIG
UUDD 132230Z 08006MPS 050V110 0900 0800E R14R/P2000 +SN VV009 M12/M15 Q1008 R14R/490337 NOSIG
UUDD 132200Z 08006MPS 050V110 1100 1000W R14R/1900 SN OVC010 M12/M14 Q1009 REBLSN R14R/490337 NOSIG

Metars St. Petersburg:
ULLI 140500Z 06003MPS 9999 -SN FEW009 M14/M16 Q1018 R10R/450545 NOSIG=
ULLI 140430Z 06004MPS 030V090 9999 -SN FEW010 M14/M16 Q1018 R10R/450545 NOSIG=
ULLI 140400Z 06003MPS 9999 -SN FEW010 M14/M16 Q1018 R10R/450545 NOSIG=
ULLI 140330Z 07003MPS 9999 -SN SCT011 M14/M17 Q1018 R10R/450545 NOSIG=
ULLI 140300Z 07003MPS 9999 -SN SCT010 M14/M17 Q1019 R10R/450545 NOSIG=
ULLI 140230Z 06004MPS 9999 -SN SCT009 M14/M17 Q1019 R10R/450545 NOSIG=
ULLI 140200Z 06003MPS 9999 -SN FEW009 M14/M17 Q1019 R10R/450545 NOSIG=
ULLI 140130Z 08004MPS 9999 -SN FEW009 M14/M17 Q1019 R10R/450545 NOSIG=
ULLI 140100Z 06004MPS 9999 -SN FEW010 M15/M17 Q1019 R10R/450545 NOSIG=
ULLI 140030Z 08005MPS CAVOK M14/M17 Q1019 R10R/450545 NOSIG=
ULLI 140000Z 08005MPS CAVOK M14/M17 Q1019 R10R/450545 NOSIG=
ULLI 132330Z 07005MPS 9999 -SN NSC M15/M18 Q1019 R10R/450545 NOSIG=
ULLI 132300Z 07005MPS 9999 -SN NSC M14/M17 Q1019 R10R/450545 NOSIG=
ULLI 132230Z 07006MPS 9999 -SN NSC M14/M17 Q1019 R10R/450545 NOSIG=
ULLI 132200Z 09005MPS 9999 -SN FEW008 SCT040 M14/M17 Q1019 R10R/450545 NOSIG=
Incident Facts

Date of incident
Jan 14, 2021

Classification
Incident

Flight number
YC-32

Aircraft Registration
VP-BBN

Aircraft Type
Airbus A320

ICAO Type Designator
A320

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