TB21 pilot has unsafe nose gear indication and after unsuccessful attempt to lower manually; landing...

Attributes
ACN	772723
Time
Date	200801
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Trinidad TB-21
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 25 flight time total : 5500 flight time type : 180
ASRS Report	772723
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unsafe nose gear light other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Upon lowering the landing gear within the pilot's information manual vlo (maximum landing gear operating speed); the main gear indicated down and locked; the nose gear indicated unsafe; the gear-unlocked light remained illuminated; and the hydraulic power pack was audible and continued to run with its associated annunciator. After manual extension per the pilot's information manual; the nose gear again indicated unsafe; and the red gear-unlocked light was illuminated. Maneuvering to load the aircraft failed to result in a safe indication. After a fly-by; the tower said that the gear seemed to be down; however; the nose gear unsafe indication remained with an associated red gear-unlocked light. A practice approach to 100 ft AGL was conducted followed by an actual approach in which the engine was shut down proximate to main wheel touchdown. As the nose was lowered; the nosewheel collapsed resulting in damage to the propeller and lower cowling.

Original NASA ASRS Text

Title: TB21 PILOT HAS UNSAFE NOSE GEAR INDICATION AND AFTER UNSUCCESSFUL ATTEMPT TO LOWER MANUALLY; LANDING IS MADE WITH SUBSEQUENT NOSE GEAR COLLAPSE.

Narrative: UPON LOWERING THE LNDG GEAR WITHIN THE PLT'S INFO MANUAL VLO (MAX LNDG GEAR OPERATING SPD); THE MAIN GEAR INDICATED DOWN AND LOCKED; THE NOSE GEAR INDICATED UNSAFE; THE GEAR-UNLOCKED LIGHT REMAINED ILLUMINATED; AND THE HYD PWR PACK WAS AUDIBLE AND CONTINUED TO RUN WITH ITS ASSOCIATED ANNUNCIATOR. AFTER MANUAL EXTENSION PER THE PLT'S INFO MANUAL; THE NOSE GEAR AGAIN INDICATED UNSAFE; AND THE RED GEAR-UNLOCKED LIGHT WAS ILLUMINATED. MANEUVERING TO LOAD THE ACFT FAILED TO RESULT IN A SAFE INDICATION. AFTER A FLY-BY; THE TWR SAID THAT THE GEAR SEEMED TO BE DOWN; HOWEVER; THE NOSE GEAR UNSAFE INDICATION REMAINED WITH AN ASSOCIATED RED GEAR-UNLOCKED LIGHT. A PRACTICE APCH TO 100 FT AGL WAS CONDUCTED FOLLOWED BY AN ACTUAL APCH IN WHICH THE ENG WAS SHUT DOWN PROXIMATE TO MAIN WHEEL TOUCHDOWN. AS THE NOSE WAS LOWERED; THE NOSEWHEEL COLLAPSED RESULTING IN DAMAGE TO THE PROP AND LOWER COWLING.

Data retrieved from NASA's ASRS site as of May 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.

TB21 pilot has unsafe nose gear indication and after unsuccessful attempt to lower manually; landing is made with subsequent nose gear collapse.