If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user

 Actions

A320, vicinity Addis Ababa Ethiopia, 2003

From SKYbrary Wiki

Summary
On 31 March 2003, an A320, operated by British Mediterranean AW, narrowly missed colliding with terrain during a non-precision approach to Addis Ababa, Ethiopia.
Event Details
When March 2003
Actual or Potential
Event Type
CFIT
Day/Night Night
Flight Conditions IMC
Flight Details
Aircraft AIRBUS A-320
Operator BMED
Domicile United Kingdom
Type of Flight Public Transport (Passenger)
Origin Alexandria/El Nouzha Airport
Intended Destination Bole International
Actual Destination Djibouti
Flight Phase Descent
ENR / APR
Location - Airport
Airport vicinity Bole International
CFIT
Tag(s) Into terrain
Lateral Navigation Error
IFR flight plan
Safety Net Mitigations
GPWS Effective
Outcome
Damage or injury No
Causal Factor Group(s)
Group(s) Air Traffic Management
Safety Recommendation(s)
Group(s) Aircraft Airworthiness
Air Traffic Management
Investigation Type
Type Independent

Description

On 31 March 2003, an AIRBUS A-320, operated by British Mediterranean AW, narrowly missed colliding with terrain during a non-precision approach to Addis Ababa, Ethiopia.

Synopsis

The following is an extract taken from the UK AAIB report into the incident:

"[The] A320..on a flight from Alexandria…to Addis Ababa, Ethiopia, carried out two approaches using Addis Ababa [VOR] and associated…DME. On the second approach the aircraft crossed over a ridge of high ground in…IMC and came within 56 feet of terrain at a location 5 nm to the northeast of the airport. As the aircraft croosed the ridge the crew, alerted a few seconds earlier by a radio altimeter (RA) height callout, carried out a go-around: at the same time the…EGPWS generated a "TOO LOW TERRAIN" aural alert.

The investigation determined that the antenna of the ADS VOR had suffered water ingress and was not functioning correctly. The correct maintenance procedures for the ADS VOR/DME and its associated monitoring equipment were not followed.

The aircraft received erroneous information from the ADS VOR which was fed to the flight deck VOR display, the FMS, the navigation displays and the EGPWS computer with its associated Terrain Awareness Display (TAD). A single common position source error thus adversely affected all these apparently independent navigation/situational awareness systems. The existing certification standards for the aircraft navigation systems were met but were not sufficient to protect against this problem."

Related Articles

Further Reading