LNP4 pilot reported ferrying the aircraft for maintenance after a hydraulic pump malfunctioned.

Attributes
ACN	1314558
Time
Date	201511
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	Lancair IV/IVP
Operating Under FAR Part	Part 91
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Hydraulic System Pump
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Commercial
Experience	Flight Crew Last 90 Days 40 Flight Crew Total 700 Flight Crew Type 50
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural FAR

Narrative:

We had a hydraulic pump that was performing erratically and after maintenance inspection the plane was returned to service; but we pulled the circuit breaker on the hydraulic pump and placarded it as inoperable for the flight as a precaution after initially charging the hydraulic pressure in case any was needed. As a further safety precaution we elected not to raise the gear and flew below gear extension speed limits. We flew filed IFR (but entirely in VMC conditions) directly to the location of the builder of the airplane; to have the pump inspected by the people most knowledgeable about the plane; who designed and built the system; as the plane is experimental and there is no stock maintenance guide for an unfamiliar mechanic to follow.

Original NASA ASRS Text

Title: LNP4 pilot reported ferrying the aircraft for maintenance after a hydraulic pump malfunctioned.

Narrative: We had a hydraulic pump that was performing erratically and after maintenance inspection the plane was returned to service; but we pulled the circuit breaker on the hydraulic pump and placarded it as inoperable for the flight as a precaution after initially charging the hydraulic pressure in case any was needed. As a further safety precaution we elected not to raise the gear and flew below gear extension speed limits. We flew filed IFR (but entirely in VMC conditions) directly to the location of the builder of the airplane; to have the pump inspected by the people most knowledgeable about the plane; who designed and built the system; as the plane is experimental and there is no stock maintenance guide for an unfamiliar mechanic to follow.

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.