Piper pilot reported that float gear would not extend; causing a diversion and precautionary emergen...

Attributes
ACN	1741869
Time
Date	202005
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-18/19 Super Cub
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Direct
Flight Plan	None
Component
Aircraft Component	Hydraulic Lines Connectors Fittings
Person 1
Function	Captain
Qualification	Air Traffic Control Fully Certified Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Air Traffic Control Military 1 Flight Crew Last 90 Days 25 Flight Crew Total 19000 Flight Crew Type 250
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

Departed a marina for ZZZ for prop servicing. On descent to land at ZZZ float gear would not extend. Performed emergency extension but gear would only go to an intermediate position before all hydraulic pressure was lost. Unable to contact anyone at ZZZ; declared urgency on guard and with approach. Diverted to ZZZ1 for low level approach to check gear configuration confirming only left nose gear down. Circling nearby used steep bank to recover some hydraulic fluid to pump and rapid pitch movements to lower gear. All but front right nose gear showed green and locked. Executed full flap soft field landing to runway xxr. On contact with mains; front gear locked in place and gently pitched forward to gently place weight on nose gear. Aircraft was able to taxi short distance to FBO for inspection. On inspection; the primary gear hydraulic line had made contact with the lower cowling wearing a hole in the cowling. The rough edges of the hole in the cowling cut into the stainless steel jacked hydraulic line causing catastrophic loss of hydraulic fluid. Hydraulic line was replaced with new; line verified for proper clearance from cowling; gear cycled 5 times and aircraft returned to service.

Original NASA ASRS Text

Title: Piper pilot reported that float gear would not extend; causing a diversion and precautionary emergency landing.

Narrative: Departed a marina for ZZZ for prop servicing. On descent to land at ZZZ float gear would not extend. Performed emergency extension but gear would only go to an intermediate position before all hydraulic pressure was lost. Unable to contact anyone at ZZZ; declared urgency on Guard and with Approach. Diverted to ZZZ1 for low level approach to check gear configuration confirming only left nose gear down. Circling nearby used steep bank to recover some hydraulic fluid to pump and rapid pitch movements to lower gear. All but front right nose gear showed green and locked. Executed full flap soft field landing to Runway XXR. On contact with mains; front gear locked in place and gently pitched forward to gently place weight on nose gear. Aircraft was able to taxi short distance to FBO for inspection. On inspection; the primary gear hydraulic line had made contact with the lower cowling wearing a hole in the cowling. The rough edges of the hole in the cowling cut into the stainless steel jacked hydraulic line causing catastrophic loss of hydraulic fluid. Hydraulic line was replaced with new; line verified for proper clearance from cowling; gear cycled 5 times and aircraft returned to service.

Data retrieved from NASA's ASRS site 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.