OpenAirDocs.org

19960124019679I

Incident
Open the Markdown

FAA incident report · Doug DC-9-31 · Cleveland, OH · January 24, 1996

FAA Aviation Safety Information Portal

© OpenStreetMap
Date
January 24, 1996 · 11:59 local
Place
Cleveland, OH
Airport
Cleveland-Hopkins International
Phase of flight
Descent
Operating rules
Air carrier (Part 121)
Operator
NWAA
Aircraft
N9341
Reported as
Doug DC931
Reported engine
Pratt & Whitney JT8D5
People aboard
2
Fatal injuries
0
Pilot’s flight hours
17,640 total9,616 in this make and model199 in the last 90 days
N9341Registration cancelled Nov 19, 2013 · Douglas DC-9-31S/N 47390 · Built 1969Airframe modelDouglas DC-9-31Engine modelPratt & Whitney JT8D-5Turbo-jet

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

Narrative: NWA604 was inbound to Cleveland Hopkins from the northwest NWA604 was given a clearance to 7000'. Which they acknowledged. A commuter bta 3110 departing Cleveland and climbing to 6000'. Approximately ten miles northwest of Cleveland, NWA604 was observed by the controller to be at 6600', instead of 7000'. NWA604 advised he had a TCAS alert and was climbing. Ata was issued and acknowledged 6000'. Although he was at mode c showed 6,200'. Investigation revealed that the radar reinforced target report shows NWA604 level at 6600' prior to climbing to 7100' (TCAS) then back down to 6600' prior to his descent into Cleveland. Northwest airlines (Mr. Larry ganse) was contacted to find if NWA604 reported any maintenance problems (encoder, transponder, altimeter, pdc., etc.), none were reported. The crew statements show them level ata 7000' climbing to 7400' after the TCAS alert (400' climb). The altimeter at Cleveland was 29:55 at 1653 gtc. If the acft was on 29:92, the current 29:55 would allow the crew to be 370' below 7000' or 6630'. Crew allowed aircraft to remain 350-400' below assigned altitude (twice) privacy data omitted

As the FAA filed it

NARRATIVE: NWA604 WAS INBOUND TO CLEVELAND HOPKINS FROM THE NORTHWEST NWA604 WAS GIVEN A CLEARANCE TO 7000'. WHICH THEY ACKNOWLEDGED. A COMMUTER BTA 3110 DEPARTING CLEVELAND AND CLIMBING TO 6000'. APPROXIMATELY TEN MILES NORTHWEST OF CLEVELAND, NWA604 WAS OBSERVED BY THE CONTROLLER TO BE AT 6600', INSTEAD OF 7000'. NWA604 ADVISED HE HAD A TCAS ALERT AND WAS CLIMBING. ATA WAS ISSUED AND ACKNOWLEDGED 6000'. ALTHOUGH HE WAS AT MODE C SHOWED 6,200'. INVESTIGATION REVEALED THAT THE RADAR REINFORCED TARGET REPORT SHOWS NWA604 LEVEL AT 6600' PRIOR TO CLIMBING TO 7100' (TCAS) THEN BACK DOWN TO 6600' PRIOR TO HIS DESCENT INTO CLEVELAND. NORTHWEST AIRLINES (MR. LARRY GANSE) WAS CONTACTED TO FIND IF NWA604 REPORTED ANY MAINTENANCE PROBLEMS (ENCODER, TRANSPONDER, ALTIMETER, PDC., ETC.), NONE WERE REPORTED. THE CREW STATEMENTS SHOW THEM LEVEL ATA 7000' CLIMBING TO 7400' AFTER THE TCAS ALERT (400' CLIMB). THE ALTIMETER AT CLEVELAND WAS 29:55 AT 1653 GTC. IF THE ACFT WAS ON 29:92, THE CURRENT 29:55 WOULD ALLOW THE CREW TO BE 370' BELOW 7000' OR 6630'. CREW ALLOWED AIRCRAFT TO REMAIN 350-400' BELOW ASSIGNED ALTITUDE (TWICE) ^PRIVACY DATA OMITTED^