KLM Cityhopper Flight 433

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KLM Cityhopper Flight 433
PH-KSH @ AMS 28 sept 1990 by Johan Hetebrij SAAB 340B, PH-KSH, KLM cityhopper.jpg
PH-KSH, the KLM Cityhopper Saab 340 involved in the accident, four years before the crash
Accident
Date4 April 1994
SummaryCrashed following loss of control and pilot error during go-around
Site Amsterdam Schiphol Airport, Amsterdam, Netherlands
52°17′26″N4°44′59″E / 52.2906°N 4.7498°E / 52.2906; 4.7498
Aircraft
Aircraft type Saab 340B
Aircraft name City of Hamburg [1]
Operator KLM Cityhopper
IATA flight No.KL433
Call signKLM 433
Registration PH-KSH
Flight origin Amsterdam Schiphol Airport, Amsterdam, Netherlands
Destination Cardiff International Airport, Cardiff, Wales
Occupants24
Passengers21
Crew3
Fatalities3
Injuries20
Survivors21

KLM Cityhopper Flight 433 was a Saab 340B, registered as PH-KSH, which crashed during an emergency landing on 4 April 1994 and killing 3 occupants, including the captain. Flight 433 was a routine scheduled flight from Amsterdam, the Netherlands, to Cardiff, Wales, United Kingdom. The accident was caused by inadequate pilot training and a faulty sensor, leading to loss of control during go-around.

Contents

Accident

The aircraft took off from Runway 24 at Schiphol Airport at 14:19 local time, with the captain as the pilot flying. At 14:30, the pilots received a false warning of low oil pressure in the right engine, caused by a short circuit. While the first officer consulted the emergency checklist, the captain unilaterally set the right engine's power to idle, probably to reduce the risk of damage. However, the oil pressure gauge was still showing above 30 psi (210 kPa), indicating that oil pressure was within safe limits and the warning was false. The checklist recommended continuing normal flight operations under the circumstances. [2] [3] :38

However, the captain did not return the engine to the previous throttle setting, leaving the aircraft effectively flying on one engine. As the Saab approached flight level 170 (17,000 feet [5,182 m]), the loss of power degraded the aircraft's climb performance. The crew misinterpreted this, and decreasing oil pressure from the retarding right engine, as confirmation that the engine was faulty. [2] A Pan-Pan call was made at 14:33, requesting to return to Schiphol.

The captain had not anticipated the consequences of flying with one engine at idle, and was unable to stabilise the final approach onto Runway 06; the situation was aggravated by an 8-knot (15 km/h; 9.2 mph) tailwind. He also disengaged the autopilot, while the first officer neutralised the rudder trim, both of which had been compensating for the asymmetric thrust. During this time the aircraft fell below the glideslope and airspeed decreased to 115 knots (213 km/h; 132 mph), below the target approach speed of 125 knots (232 km/h; 144 mph). In response, the captain increased torque on the left engine, causing the aircraft to veer to the right of the runway. The crew did not apply additional rudder deflection to correct it, instead relying on the ailerons. [4] [3] :18

At a height of 45 feet (14 m), the captain decided to perform a go-around, and commanded full throttle to the left engine, while leaving the right engine at idle. The crew continued to only use the ailerons to counteract the thrust imbalance. The aircraft rolled to the right and pitched up, while airspeed decayed to 105 knots (194 km/h; 121 mph), activating the stall warning. Some rudder deflection was applied afterwards, and full deflection was applied 8 seconds later, but the aircraft was unrecoverable as airspeed decreased to 93 knots (172 km/h; 107 mph) and the right bank increased to 80 degrees. [5] [3] :18

At 14:46 local time, the aircraft crashed in a field just outside the airport, 560 metres (1,837 ft; 612 yd) from the runway. Of the 24 people on board, 3 were killed—the captain and 2 passengers. Out of the 21 survivors, 9 suffered serious injuries, including the first officer. Due to amnesia caused by the accident, the first officer could not recall the accident. [3] :27

Background

Aircraft

The aircraft involved was a Saab 340B, registered as PH-KSH, with serial number 195, which had first flown in 1990. The aircraft was powered by two General Electric CT7-9B turboshaft engines and had flown 6,558 hours at the time of the accident. [4]

Crew

In command was 37-year-old Captain Gerrit Lievaart. He had been with KLM Cityhopper since 2 March 1992. He had a total of 2,605 hours flying time, including 1,214 hours on a Saab 340. However, training records revealed that he had failed two engine-out checks, and on his most recent one had been given a "standard minus," the lowest passing grade. His co-pilot was 34-year old First Officer Paul Stassen. He had been with KLM Cityhopper since 27 January 1992. He had a total of 1,718 hours flying time, including 1,334 hours on a Saab 340. [3] :19–20

Accident investigation

KLM Cityhopper Flight 433 seating chart based on the NASB report, revealing locations of passengers, severity of injuries, and deaths Klmc433injurymap.png
KLM Cityhopper Flight 433 seating chart based on the NASB report, revealing locations of passengers, severity of injuries, and deaths

The final report from the Netherlands Aviation Safety Board found that pilot error, through inadequate use of flight controls during unequal throttle go-around, resulting in loss of control, was the primary cause of the accident. In addition, the report included recommendations directed at KLM, regarding contributing factors, addressing: improved training on crew resource management; improved pilot assessment techniques; and improved guidance on flying with an idle engine. [2] In addition, the report found that the crash was generally survivable, with the captain's death attributable to not wearing his shoulder restraints. [3] :27

The crash of KLM Cityhopper Flight 433 was covered in 2019 in "Fatal Approach", an episode of the internationally syndicated Canadian TV documentary series Mayday . [2]

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References

  1. "Photo of Saab 340B PH-KSH - Aviation Safety Network".
  2. 1 2 3 4 "Fatal Approach". Mayday . Season 19. Episode 3. Cineflix. 16 January 2019. Discovery Channel Canada.
  3. 1 2 3 4 5 6 "PH-KSH Final Report" (PDF). asn.flightsafety.org. Retrieved 27 January 2025.
  4. 1 2 Ranter, Harro. "ASN Aircraft accident Saab 340B PH-KSH Amsterdam-Schiphol Airport (AMS)". aviation-safety.net. Aviation Safety Network. Retrieved 30 June 2017.
  5. "PH-KSH". www.aviacrash.nl.