Corporate director reported that a B737 was released from a heavy maintenance visit with protective ...

Narrative:

Several months after departing heavy maintenance (in maintenance for 9 weeks); the flight crew reported a problem with electric trim not operating. The crew suspected an electrical problem with the electric trim failure. After landing the flight mechanic investigated the area in the tail around the stabilizer and jackscrew. He found the jackscrew had been wrapped with fabric or heavy cloth and held in place with tape. No one had accessed the jack screw area since the aircraft departed heavy maintenance months earlier.our flight mechanic removed the fabric from the jackscrew and no further trim issues have been reported. I realize this is a potentially serious problem that could have caused a jammed stabilizer and this is the reason I am making this report. An additional problem that happened shortly after heavy maintenance; we discovered that [the maintenance facility] switched the #1 and #2 engine oil quantity indicators to wrong engine. We would add oil to #2 engine but no change to oil quantity in cockpit. I had mechanic drain #1 engine oil to find that #2 engine oil showed empty and #1 oil quantity showed full. The mechanic corrected the engine oil quantity gauges to correct engines.

Original NASA ASRS Text

Title: Corporate Director reported that a B737 was released from a heavy maintenance visit with protective material intering with the stabilizer trim mechanism.

Narrative: Several months after departing heavy maintenance (in maintenance for 9 weeks); the flight crew reported a problem with electric trim not operating. The crew suspected an electrical problem with the electric trim failure. After landing the flight mechanic investigated the area in the tail around the stabilizer and jackscrew. He found the jackscrew had been wrapped with fabric or heavy cloth and held in place with tape. No one had accessed the jack screw area since the aircraft departed heavy maintenance months earlier.Our flight mechanic removed the fabric from the jackscrew and no further trim issues have been reported. I realize this is a potentially serious problem that could have caused a jammed stabilizer and this is the reason I am making this report. An additional problem that happened shortly after heavy maintenance; we discovered that [the maintenance facility] switched the #1 and #2 engine oil quantity indicators to wrong engine. We would add oil to #2 engine but no change to oil quantity in cockpit. I had mechanic drain #1 engine oil to find that #2 engine oil showed empty and #1 oil quantity showed full. The mechanic corrected the engine oil quantity gauges to correct engines.

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	1415960
Time
Date	201611
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 125
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Horizontal Stabilizer Control
Person 1
Function	Other / Unknown
Qualification	Flight Crew Air Transport Pilot (ATP) Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance

Corporate director reported that a B737 was released from a heavy maintenance visit with protective material intering with the stabilizer trim mechanism.