LR24 flight crew forgets landing gear and gear warning horn does not sound. Successful go around is ...

Attributes
ACN	758537
Time
Date	200710
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Learjet 24
Operating Under FAR Part	Part 135
Flight Phase	landing : roll
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 3800 flight time type : 700
ASRS Report	758537
Events
Anomaly	aircraft equipment problem : less severe ground encounters : gear up landing non adherence : company policies
Independent Detector	other flight crewa
Resolutory Action	flight crew : executed go around
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

The flight took off on a VFR flight following flight plan to the ZZZ airport uneventful with the first officer flying (PF). The flight was cleared to the final altitude of 3000 ft. The ATIS was requested by the first officer and the ceiling were reported to be 600 ft overcast and IMC conditions existed at the airport; the active runway in use was runway xx with the instrument approach being the ILS for xx. At approximately 10 NM from the airport and with a speed of about 190 KTS approach flaps was requested by the first officer; flaps setting was confirmed. After been cleared for the ILS approach to runway xx and with the localizer needle alive the standard call of 'flaps 20; gear down; before landing checklist' was initiated by the first officer. At GS intercept full flaps were requested. At about the same time the captain (PNF) went ahead and did a simulated engine failure. I immediately told him flaps 20 and he replied saying 'that is what I want to hear' while giving back the engine. The GS was noted to be oscillating at this time and was reported to the tower. The approach continued and just at the touchdown point a grinding sound was heard. We immediately initiated maximum takeoff thrust; realizing that the gear were not down we went around and after deploying the gear and doing the before landing checklist we did a normal landing. After landing the captain commented that the gear horn warning was inoperative. This was confirmed by both of us with the captain agreeing that he did not put the gear down when asked. This accident was due to the captain deviating from standard operating procedure by doing a simulated engine failure in IMC conditions and not deploying the gear when ask to; however I also forgot to confirm the gear were down due to my preoccupation with the oscillating GS; damage to the flaps were minimal; and there was no structural damage.

Original NASA ASRS Text

Title: LR24 FLT CREW FORGETS LANDING GEAR AND GEAR WARNING HORN DOES NOT SOUND. SUCCESSFUL GO AROUND IS INITIATED WHEN SCRAPING NOISES ARE HEARD; AND AN UNEVENTFUL GEAR DOWN LANDING ENSUES.

Narrative: THE FLT TOOK OFF ON A VFR FLT FOLLOWING FLT PLAN TO THE ZZZ ARPT UNEVENTFUL WITH THE FO FLYING (PF). THE FLT WAS CLRED TO THE FINAL ALT OF 3000 FT. THE ATIS WAS REQUESTED BY THE FO AND THE CEILING WERE RPTED TO BE 600 FT OVCST AND IMC CONDITIONS EXISTED AT THE ARPT; THE ACTIVE RWY IN USE WAS RWY XX WITH THE INST APCH BEING THE ILS FOR XX. AT APPROX 10 NM FROM THE ARPT AND WITH A SPD OF ABOUT 190 KTS APCH FLAPS WAS REQUESTED BY THE FO; FLAPS SETTING WAS CONFIRMED. AFTER BEEN CLRED FOR THE ILS APCH TO RWY XX AND WITH THE LOC NEEDLE ALIVE THE STANDARD CALL OF 'FLAPS 20; GEAR DOWN; BEFORE LNDG CHKLIST' WAS INITIATED BY THE FO. AT GS INTERCEPT FULL FLAPS WERE REQUESTED. AT ABOUT THE SAME TIME THE CAPT (PNF) WENT AHEAD AND DID A SIMULATED ENG FAILURE. I IMMEDIATELY TOLD HIM FLAPS 20 AND HE REPLIED SAYING 'THAT IS WHAT I WANT TO HEAR' WHILE GIVING BACK THE ENG. THE GS WAS NOTED TO BE OSCILLATING AT THIS TIME AND WAS RPTED TO THE TWR. THE APCH CONTINUED AND JUST AT THE TOUCHDOWN POINT A GRINDING SOUND WAS HEARD. WE IMMEDIATELY INITIATED MAX TKOF THRUST; REALIZING THAT THE GEAR WERE NOT DOWN WE WENT AROUND AND AFTER DEPLOYING THE GEAR AND DOING THE BEFORE LNDG CHKLIST WE DID A NORMAL LNDG. AFTER LNDG THE CAPT COMMENTED THAT THE GEAR HORN WARNING WAS INOP. THIS WAS CONFIRMED BY BOTH OF US WITH THE CAPT AGREEING THAT HE DID NOT PUT THE GEAR DOWN WHEN ASKED. THIS ACCIDENT WAS DUE TO THE CAPT DEVIATING FROM STANDARD OPERATING PROC BY DOING A SIMULATED ENG FAILURE IN IMC CONDITIONS AND NOT DEPLOYING THE GEAR WHEN ASK TO; HOWEVER I ALSO FORGOT TO CONFIRM THE GEAR WERE DOWN DUE TO MY PREOCCUPATION WITH THE OSCILLATING GS; DAMAGE TO THE FLAPS WERE MINIMAL; AND THERE WAS NO STRUCTURAL DAMAGE.

Data retrieved from NASA's ASRS site as of January 2009 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.

LR24 flight crew forgets landing gear and gear warning horn does not sound. Successful go around is initiated when scraping noises are heard; and an uneventful gear down landing ensues.