Casualties unknown

1984-12-21: Aero Commander 690A (N9229Y) — Northwest Air Charter — Pea Ridge, AR

Pea Ridge, AR, US

On December 21, 1984, an Aero Commander 690A (registration N9229Y) operated by Northwest Air Charter was involved in an aviation accident near Pea Ridge, AR. Investigators recorded the probable cause as: The pilot's failure to properly set the altimeter to the correct local value provided by air traffic control, which resulted in an inaccurate altitude indication and descent below the minimum safe altitude during the approach. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards

An aircraft crashed into trees short of the runway while on a VOR/DME approach because the pilot used an incorrect altimeter setting, resulting in a significant altitude error.

What happened

The flight was cleared for a VOR/DME approach to Rogers Municipal Airport by Fayetteville Approach Control. The controller provided the local altimeter setting of 29.85 inches of mercury, a fact confirmed by recorded air traffic control transcripts. The pilot did not read back this critical information. During the descent phase of the approach, the aircraft struck trees approximately 3 miles short of the airport runway. The impact occurred at an altitude of roughly 1,320 feet mean sea level, which was only 25 feet above ground level.

The investigation

Post-accident examination of the aircraft revealed that the pilot had set the altimeter to 30.14 inches of mercury instead of the correct value provided by approach control. This incorrect setting caused the instrument to indicate an altitude approximately 290 feet higher than the aircraft's actual position. The pilot later recalled that the setting of 30.14 had been furnished by approach control, indicating a misunderstanding or miscommunication during the frequency exchange. The pilot also stated that the last altitude reading remembered was 1,750 feet.

Findings

Review of the published approach plate for Rogers Municipal Airport showed a minimum descent altitude (MDA) of 1,700 feet when using the local altimeter setting. The plate included a specific note requiring an increase of 100 feet to the MDA if using the Fayetteville altimeter setting, which would have made the correct minimum 1,800 feet. The pilot's last recalled altitude of 1,750 feet was below this adjusted minimum safe altitude. The discrepancy between the indicated and actual altitude, combined with failure to verify the correct altimeter setting, contributed to the controlled flight into terrain.

Safety message

Pilots must carefully verify and cross-check all air traffic control instructions, particularly when receiving weather data such as altimeter settings. Reading back these values is a critical safety practice to ensure both parties are aligned on the same information before proceeding with instrument approaches.

Probable cause

The pilot's failure to properly set the altimeter to the correct local value provided by air traffic control, which resulted in an inaccurate altitude indication and descent below the minimum safe altitude during the approach.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X41864. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.