Narrative:

After a normal 15 flap take-off; the flaps were retracted at 400 ft. The hydraulic press annunciator remained illuminated with the flaps in the 0 position. The stabilizer miscompare then illuminated with a flashing caution indication. The speed was kept below 200 KIAS. Abnormal check lists were completed; but the hydraulic system remained pressurized indicating a possible bypass valve failure. In accordance with the checklist it was decided to land as soon as practical. Whilst setting up for the landing; about 5 minutes after checklist completion; and before any flap or gear selections were made; the abnormality appeared to clear itself. An uneventful normal landing was effected. Throughout the event; the crew discussed the problem and proceeded in a professional manner and unhurried pace. Subsequently; the company was appraised of the situation and maintenance control decided that the aircraft should be written up and not MEL'ed. Fortunately; there was another airframe at the FBO; so a crew swap was effected and the planned trip continued some 3 hours behind schedule. Throughout; the passenger was kept fully informed and he appeared to take it all in stride.although there appeared to be some pressure from the company to continue the flight under MEL; neither pilot was prepared to accept this as the most desirable or safest action.

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Original NASA ASRS Text

Title: CE560XL experiences HYD PRESS annunciator after flap retraction on departure. Checklist procedures are complied with to no avail and crew elects to return to departure airport. Caution light extinguishes prior to landing.

Narrative: After a normal 15 flap take-off; the flaps were retracted at 400 FT. The HYD PRESS annunciator remained illuminated with the flaps in the 0 position. The STAB MISCOMPARE then illuminated with a flashing CAUTION indication. The speed was kept below 200 KIAS. Abnormal Check Lists were completed; but the Hydraulic System remained pressurized indicating a possible Bypass Valve failure. In accordance with the checklist it was decided to land as soon as practical. Whilst setting up for the landing; about 5 minutes after checklist completion; and before any flap or gear selections were made; the abnormality appeared to clear itself. An uneventful normal landing was effected. Throughout the event; the crew discussed the problem and proceeded in a professional manner and unhurried pace. Subsequently; the Company was appraised of the situation and Maintenance Control decided that the aircraft should be written up and not MEL'ed. Fortunately; there was another airframe at the FBO; so a crew swap was effected and the planned trip continued some 3 hours behind schedule. Throughout; the passenger was kept fully informed and he appeared to take it all in stride.Although there appeared to be some pressure from the Company to continue the flight under MEL; neither pilot was prepared to accept this as the most desirable or safest action.

Data retrieved from NASA's ASRS site as of April 2012 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.