A flight instructor describes the efforts of a student pilot and himself to manually extend the land...

Narrative:

Landing gear recently serviced re: uplock switch. Preflight indicated hydraulic fluid not full; noticed in sight glass. Notified mechanic who affirmed it was full and probably overfilled. Possible bubble at sight glass. Went on word of mechanic and after further preflight departed on an instrument training flight ZZZ-ZZZ1. Upon gear retraction at takeoff; the uplocks released and [gear] failed to retract further; hanging in the 'wasp leg' position. Having the instrument student continue flying the aircraft; recycled the gear...little movement observed in the mirrors owner had installed under each wing. Contacted ATC that we needed to troubleshoot a landing gear issue while holding over ZZZ2. For the next 45 minutes we (instrument student and myself) communicated with the aircraft's owner on the ground via text messaging initially; followed by radio on a discrete frequency while he was in contact with the mechanic. Recycled the gear several times with very little movement and initiated the emergency gear extension procedures using the hand pump. Upon pulling out the handle all the way to the extension; the handle would not move up or down as it seemed 'locked.' at that point recycled the gear handle several times noticing a fair amount of movement in the landing gear (reference mirrors) indicating there was some hydraulic fluid in the system. Student reached for the handle and was able to release it with a firm upwards movement and we were able to further pump the gear down to confirm locked. Declared an emergency and preceeded to land [returned to] ZZZ with a runway flyby for the tower to visually confirm landing gear extension; most noticeably the nose gear. Landed uneventfully on 18R and taxied to FBO. Aircraft was put up jacks for a landing gear checks about an hour later confirming fluid was low; most likely due to the aircraft was connected to the hydraulic 'mule' after it's servicing and the fluid drained out. Several swings of the landing gear during the course of the next 30 minutes on jacks confirmed there was no mechanical concerns. A test flight was completed later that evening indicating no extension or retraction issues.

Original NASA ASRS Text

Title: A Flight Instructor describes the efforts of a student pilot and himself to manually extend the landing gears on a Cessna C210 aircraft after takeoff when all three gears failed to fully retract. Landing gears were hanging in the 'Wasp Leg' position. Low Hydraulic fluid quantity was a contributor.

Narrative: Landing gear recently serviced re: uplock switch. Preflight indicated hydraulic fluid not full; noticed in sight glass. Notified mechanic who affirmed it was full and probably overfilled. Possible bubble at sight glass. Went on word of mechanic and after further preflight departed on an instrument training flight ZZZ-ZZZ1. Upon gear retraction at takeoff; the uplocks released and [gear] failed to retract further; hanging in the 'wasp leg' position. Having the instrument student continue flying the aircraft; recycled the gear...little movement observed in the mirrors owner had installed under each wing. Contacted ATC that we needed to troubleshoot a landing gear issue while holding over ZZZ2. For the next 45 minutes we (instrument student and myself) communicated with the aircraft's owner on the ground via text messaging initially; followed by radio on a discrete frequency while he was in contact with the mechanic. Recycled the gear several times with very little movement and initiated the emergency gear extension procedures using the hand pump. Upon pulling out the handle all the way to the extension; the handle would not move up or down as it seemed 'locked.' At that point recycled the gear handle several times noticing a fair amount of movement in the landing gear (reference mirrors) indicating there was some hydraulic fluid in the system. Student reached for the handle and was able to release it with a firm upwards movement and we were able to further pump the gear down to confirm locked. Declared an emergency and preceeded to land [returned to] ZZZ with a runway flyby for the Tower to visually confirm landing gear extension; most noticeably the nose gear. Landed uneventfully on 18R and taxied to FBO. Aircraft was put up jacks for a landing gear checks about an hour later confirming fluid was low; most likely due to the aircraft was connected to the hydraulic 'mule' after it's servicing and the fluid drained out. Several swings of the landing gear during the course of the next 30 minutes on jacks confirmed there was no mechanical concerns. A test flight was completed later that evening indicating no extension or retraction issues.

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.

Attributes
ACN	1206876
Time
Date	201409
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C 210D
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Landing Gear
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 20 Flight Crew Total 4100 Flight Crew Type 250
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Other / Unknown Inflight Event / Encounter Other / Unknown

A flight instructor describes the efforts of a student pilot and himself to manually extend the landing gears on a cessna C210 aircraft after takeoff when all three gears failed to fully retract. Landing gears were hanging in the 'wasp leg' position. Low hydraulic fluid quantity was a contributor.