Accident Boeing 737-8AS (WL) EI-DYG,

ASN Wikibase Occurrence # 321610

Date:	Monday 10 November 2008
Time:	07:56
Type:	Boeing 737-8AS (WL)
Owner/operator:	Ryanair
Registration:	EI-DYG
MSN:	33639/2557
Year of manufacture:	2008
Total airframe hrs:	2419 hours
Cycles:	1498 flights
Engine model:	CFMI CFM56-7B26/3
Fatalities:	Fatalities: 0 / Occupants: 172
Aircraft damage:	Substantial, written off
Category:	Accident
Location:	Roma-Ciampino Airport (CIA) - Italy
Phase:	Landing
Nature:	Passenger - Scheduled
Departure airport:	Frankfurt-Hahn Airport (HHN/EDFH)
Destination airport:	Roma-Ciampino Airport (CIA/LIRA)
Investigating agency:	ANSV
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
Ryanair flight 4102, a Boeing 737-800, departed Hahn Airport, Germany, at 06:30 for a flight to Rome-Ciampino Airport, Italy.
The first officer was the Pilot Flying on the leg whilst the captain was the Pilot Monitoring.
The flight was uneventful until the approach phase at the destination airport. The aircraft established the first radio contact with Ciampino Tower, communicating that it was 9 NM from the runway and stabilised on the ILS for runway 15.
The aircraft, authorized and configured for the approach, was proceeding for landing, when, at a height of 136 ft and a distance of about 300 m from the runway, the captain noticed birds on the flight trajectory. He stated "Ahi", repeated in rapid sequence. At a distance of about 100 m from the runway, the TO/GA pushbutton was activated. The first officer acknowledged: "Go around, flaps 15", setting the go around attitude. At the same time as the TO/GA was activated, the aircaft collided with a thick flock of some 86 starlings. A loud bang was heard and both engines stalled. The aircraft climbed to 173 feet and then continued to lose height, despite the nose-up command.
There was a progressive speed reduction and an increase of the angle of attack until the activation of the stick shaker, which was recorded at 21 feet. The aircraft hit the ground in aerodynamic stall conditions, near taxiway AC, about half way along the total length of the runway at a vertical acceleration of 2.66g.
First contact with the runway occurred with the main landing gear properly extended and with the lower part of the fuselage tail section. The left main landing gear detached from its attachment during the landing run and the lower part of the left engine nacelle came into contact with the runway. The aircraft stopped near the threshold of runway 33.
The fire brigade sprayed extinguishing foam around the area where the engine nacelle had come into contact with the runway. The captain then arranged for the disembarkation of the passengers and crew using a ladder truck from the right front door, with the addition of the right rear slide, later activated and used.

CAUSES
The accident has been caused by an unexpected loss of both engines thrust as a consequence of a massive bird strike, during the go-around manoeuvre.
The loss of thrust has prevented the aircrew from performing a successful go around and has led the aircraft to an unstabilized runway contact.
The following factors have contributed to the event:
- the inadequate effectiveness of bird control and dispersal measures put in place by the airport operator at the time of the accident;
- the captain decision to perform a go around, when the aircraft was at approximately 7 seconds from touchdown. The above decision was significantly influenced by:
1. the lack of instructions to flight crew concerning the most suitable procedures to adopt in the case of single or multiple bird strikes in the landing phase;
2. the absence of specific training in the management, by the flight crew, of the "surprise" and "startle" effects in critical phases of the flight.

Accident investigation: