Taxiing on a congested ramp, a PA18 pilot applies excessive braking for the conditions causing the a...

Attributes
ACN	621699
Time
Date	200406
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : szt.airport
State Reference	ID
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	PA-18/19 Super Cub
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	None
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	ground : taxi
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi
Experience	flight time last 90 days : 9 flight time total : 13900 flight time type : 1000
ASRS Report	621699
Person 2
Function	oversight : pic
Events
Anomaly	conflict : ground critical
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	other
Miss Distance	horizontal : 50
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

After landing, I proceeded to taxi towards the fueling island. The island was congested and additional aircraft were parked on or near the taxiway leading to the fuel facility. I was taxiing slowly at essentially idle power when a traffic conflict arose from an aircraft ahead and to my right. I applied immediately braking which caused the aircraft to nose over with a subsequent propeller strike. The aircraft is a cub crafters top cub and is equipped with 26 inch tundra tires, cleveland double puck brakes, triple pressure brake boosters, and a center of gravity aligned near the leading edge of the center of gravity envelope. All of the above factors greatly increased the possibility of brake locking and aircraft nose-over. Future corrective actions: 1) better pilot knowledge and experience concerning the ability to discern the braking intensity required to lock up the brakes and wheels during slow speed taxi, particularly in an aircraft with brake modifications permitting greatly increased brake effectiveness. 2) more rapid scanning to the front and side of the aircraft during taxi operations, especially in the vicinity of busy fueling island activities.

Original NASA ASRS Text

Title: TAXIING ON A CONGESTED RAMP, A PA18 PLT APPLIES EXCESSIVE BRAKING FOR THE CONDITIONS CAUSING THE ACFT TO NOSE OVER ENOUGH TO ALLOW THE PROP TO STRIKE THE GND.

Narrative: AFTER LNDG, I PROCEEDED TO TAXI TOWARDS THE FUELING ISLAND. THE ISLAND WAS CONGESTED AND ADDITIONAL ACFT WERE PARKED ON OR NEAR THE TXWY LEADING TO THE FUEL FACILITY. I WAS TAXIING SLOWLY AT ESSENTIALLY IDLE PWR WHEN A TFC CONFLICT AROSE FROM AN ACFT AHEAD AND TO MY R. I APPLIED IMMEDIATELY BRAKING WHICH CAUSED THE ACFT TO NOSE OVER WITH A SUBSEQUENT PROP STRIKE. THE ACFT IS A CUB CRAFTERS TOP CUB AND IS EQUIPPED WITH 26 INCH TUNDRA TIRES, CLEVELAND DOUBLE PUCK BRAKES, TRIPLE PRESSURE BRAKE BOOSTERS, AND A CTR OF GRAVITY ALIGNED NEAR THE LEADING EDGE OF THE CTR OF GRAVITY ENVELOPE. ALL OF THE ABOVE FACTORS GREATLY INCREASED THE POSSIBILITY OF BRAKE LOCKING AND ACFT NOSE-OVER. FUTURE CORRECTIVE ACTIONS: 1) BETTER PLT KNOWLEDGE AND EXPERIENCE CONCERNING THE ABILITY TO DISCERN THE BRAKING INTENSITY REQUIRED TO LOCK UP THE BRAKES AND WHEELS DURING SLOW SPD TAXI, PARTICULARLY IN AN ACFT WITH BRAKE MODIFICATIONS PERMITTING GREATLY INCREASED BRAKE EFFECTIVENESS. 2) MORE RAPID SCANNING TO THE FRONT AND SIDE OF THE ACFT DURING TAXI OPS, ESPECIALLY IN THE VICINITY OF BUSY FUELING ISLAND ACTIVITIES.

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.

Taxiing on a congested ramp, a PA18 pilot applies excessive braking for the conditions causing the aircraft to nose over enough to allow the propeller to strike the ground.