Firm landing result in right main gear collapse.

Attributes
ACN	268319
Time
Date	199404
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : jot
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Cessna 402/402C/B379 Businessliner/Utiliner
Operating Under FAR Part	Part 135
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 2800 flight time type : 900
ASRS Report	268319
Events
Anomaly	aircraft equipment problem : critical inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	faa : reviewed incident with flight crew other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on the IFR 135 flight descended to meg and had marginal VFR conditions. Tracked the VOR radial inbound to joliet while maintaining ground contact. Approached the runway, normal landing. Landed aircraft slightly hard but not unusually. Both main tires touched then I heard a loud crunch and the right main gear collapsed. The aircraft rolled normally 2/3 of the way down the runway before gear collapsed. There were no injuries and the aircraft was still in the middle of the runway when it came to rest. Preliminary examination is that the bell crank assembly had snapped at the main right gear strut and the right main gear slowly collapsed landing gear. Believe to be strong windshear which caused an unusual sink rate which I added power and pitched aircraft nose up, but the aircraft still landed slightly hard. Callback conversation with reporter revealed the following information: FAA primarily concerned with the part 135 operator filing IFR to a destination without a legal WX observer. Conditions were VFR on arrival. Engine tear down required result of propeller strike.

Original NASA ASRS Text

Title: FIRM LNDG RESULT IN R MAIN GEAR COLLAPSE.

Narrative: WHILE ON THE IFR 135 FLT DSNDED TO MEG AND HAD MARGINAL VFR CONDITIONS. TRACKED THE VOR RADIAL INBOUND TO JOLIET WHILE MAINTAINING GND CONTACT. APCHED THE RWY, NORMAL LNDG. LANDED ACFT SLIGHTLY HARD BUT NOT UNUSUALLY. BOTH MAIN TIRES TOUCHED THEN I HEARD A LOUD CRUNCH AND THE R MAIN GEAR COLLAPSED. THE ACFT ROLLED NORMALLY 2/3 OF THE WAY DOWN THE RWY BEFORE GEAR COLLAPSED. THERE WERE NO INJURIES AND THE ACFT WAS STILL IN THE MIDDLE OF THE RWY WHEN IT CAME TO REST. PRELIMINARY EXAMINATION IS THAT THE BELL CRANK ASSEMBLY HAD SNAPPED AT THE MAIN R GEAR STRUT AND THE R MAIN GEAR SLOWLY COLLAPSED LNDG GEAR. BELIEVE TO BE STRONG WINDSHEAR WHICH CAUSED AN UNUSUAL SINK RATE WHICH I ADDED PWR AND PITCHED ACFT NOSE UP, BUT THE ACFT STILL LANDED SLIGHTLY HARD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: FAA PRIMARILY CONCERNED WITH THE PART 135 OPERATOR FILING IFR TO A DEST WITHOUT A LEGAL WX OBSERVER. CONDITIONS WERE VFR ON ARR. ENG TEAR DOWN REQUIRED RESULT OF PROP STRIKE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.