First officer of an large transport air carrier aircraft made a hard landing resulting in an unsafe ...

Attributes
ACN	247454
Time
Date	199307
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cos
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : cos
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	landing : go around landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 325
ASRS Report	247454
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5500 flight time type : 500
ASRS Report	247248
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem other other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Last flight of a 5 leg, 12:21 hour duty day. WX, not fatigue, was a factor. Copilot cleared for visual approach to runway 35L, cos, with runway 35L ILS briefed and set up as a backup. Normal right hand pattern and approach flown into 20 KT headwind. Stable 3 degree flap approach throughout with airspeed plus or minus 3 KTS fluctuation maximum. Visual illusion of being high during approach to runway 35L discussed during approach briefing, so special emphasis was placed on staying on GS and on PAPI. First indication of higher than normal sink rate noticed at approximately 50 ft. Copilot at this point had not retarded power and as I was placing my right hand on throttles to make sure the power stayed up, he rotated to catch the sink, compounding the hard landing. Aircraft bounced and the left main gear unsafe light illuminated. I advanced the throttles and initiated the go around with copilot still flying - - aircraft did not recontact the runway. Gear and flaps retracted in accordance with SOP's (30 degrees flap to 15 degrees flap) and clearance received to fly 8000 ft traffic pattern while problem looked into. Copilot continued flying and talking to ATC. I worked with so and accomplished the 'landing gear unsafe indication -- gear lever down' irregular procedure. After being assured the left main gear was indeed down and locked, an uneventful landing was accomplished. Supplemental information from acn 247248: rolling hills and the winds required numerous power changes in order to remain on profile. A rotation was initiated to slow the sink rate and the aircraft did not seem to respond normally so a more aggressive rotation was made. Supplemental information from acn 247435: captain and so accomplished the procedure for unsafe gear indication. Gear was checked safe using the cabin view ports. Passenger and flight attendants were briefed. Normal landing accomplished with no further incidents or problems. Contributing factor is that the runway 35L approach end slopes downward followed by a steady upsloping of runway.

Original NASA ASRS Text

Title: FO OF AN LGT ACR ACFT MADE A HARD LNDG RESULTING IN AN UNSAFE MAIN GEAR LIGHT AND A GAR FOR A SUBSEQUENT SUCCESSFUL LNDG.

Narrative: LAST FLT OF A 5 LEG, 12:21 HR DUTY DAY. WX, NOT FATIGUE, WAS A FACTOR. COPLT CLRED FOR VISUAL APCH TO RWY 35L, COS, WITH RWY 35L ILS BRIEFED AND SET UP AS A BACKUP. NORMAL R HAND PATTERN AND APCH FLOWN INTO 20 KT HEADWIND. STABLE 3 DEG FLAP APCH THROUGHOUT WITH AIRSPD PLUS OR MINUS 3 KTS FLUCTUATION MAX. VISUAL ILLUSION OF BEING HIGH DURING APCH TO RWY 35L DISCUSSED DURING APCH BRIEFING, SO SPECIAL EMPHASIS WAS PLACED ON STAYING ON GS AND ON PAPI. FIRST INDICATION OF HIGHER THAN NORMAL SINK RATE NOTICED AT APPROX 50 FT. COPLT AT THIS POINT HAD NOT RETARDED PWR AND AS I WAS PLACING MY R HAND ON THROTTLES TO MAKE SURE THE PWR STAYED UP, HE ROTATED TO CATCH THE SINK, COMPOUNDING THE HARD LNDG. ACFT BOUNCED AND THE L MAIN GEAR UNSAFE LIGHT ILLUMINATED. I ADVANCED THE THROTTLES AND INITIATED THE GAR WITH COPLT STILL FLYING - - ACFT DID NOT RECONTACT THE RWY. GEAR AND FLAPS RETRACTED IAW SOP'S (30 DEGS FLAP TO 15 DEGS FLAP) AND CLRNC RECEIVED TO FLY 8000 FT TFC PATTERN WHILE PROB LOOKED INTO. COPLT CONTINUED FLYING AND TALKING TO ATC. I WORKED WITH SO AND ACCOMPLISHED THE 'LNDG GEAR UNSAFE INDICATION -- GEAR LEVER DOWN' IRREGULAR PROC. AFTER BEING ASSURED THE L MAIN GEAR WAS INDEED DOWN AND LOCKED, AN UNEVENTFUL LNDG WAS ACCOMPLISHED. SUPPLEMENTAL INFO FROM ACN 247248: ROLLING HILLS AND THE WINDS REQUIRED NUMEROUS PWR CHANGES IN ORDER TO REMAIN ON PROFILE. A ROTATION WAS INITIATED TO SLOW THE SINK RATE AND THE ACFT DID NOT SEEM TO RESPOND NORMALLY SO A MORE AGGRESSIVE ROTATION WAS MADE. SUPPLEMENTAL INFO FROM ACN 247435: CAPT AND SO ACCOMPLISHED THE PROC FOR UNSAFE GEAR INDICATION. GEAR WAS CHKED SAFE USING THE CABIN VIEW PORTS. PAX AND FLT ATTENDANTS WERE BRIEFED. NORMAL LNDG ACCOMPLISHED WITH NO FURTHER INCIDENTS OR PROBS. CONTRIBUTING FACTOR IS THAT THE RWY 35L APCH END SLOPES DOWNWARD FOLLOWED BY A STEADY UPSLOPING OF RWY.

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.

First officer of an large transport air carrier aircraft made a hard landing resulting in an unsafe main gear light and a go around for a subsequent successful landing.