Narrative:

I was serving as pilot in command of a company-owned; company-operated G-1159 pursuant to 14 crash fire rescue equipment part 91 and further pursuant to the authority of a special flight permit. The aircraft special flight permit authorized the movement of the aircraft for certain maintenance; painting; and weighing to be performed. At slightly more than halfway [through the flight] the right gear box illuminated thus requiring the shutdown of the right engine. Due to the design of the accessory gearbox system; if the accessory gearbox loses a sufficient amount of lubricating oil; the abnormal procedures checklist requires that engine to be shut down to protect the integrity of the engine (although there is nothing inherently wrong with the engine). The usual culprit in such a situation is a low amount of oil in the gearbox itself. After being radar vectored to a nearby airport; we landed without incident and complied with the required reporting procedures of the airport. During the post flight inspection; there was no ascertainable evidence of leaking oil in or around the affected gearbox area. Prior to departing for the original destination; all engine and accessory gear boxes were checked and found to contain sufficient amounts of oil both prior to flight and subsequent to the recently performed engine ground runs. I then checked with our maintenance supervisor (who had acquired the special flight permit from the local FSDO). Our maintenance supervisor advised us on how to remedy this problem (which amounted to putting three quarts of oil into the gearbox). Our maintenance supervisor further advised us that we were authorized to continue on this ferry flight notwithstanding our intermediary stop. At that point we continued on to our original destination and landed without further incident. Upon post flight; the affected gear box showed no signs of leaking oil; and the oil dipstick showed more than a sufficient quantity for flight operations.

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Original NASA ASRS Text

Title: A G1159's right gear box malfunction light illuminated during a ferry flight so the engine was shut down; the aircraft landed; three quarts of oil were added and the flight continued to its planned destination.

Narrative: I was serving as pilot in command of a company-owned; company-operated G-1159 pursuant to 14 CFR Part 91 and further pursuant to the authority of a special flight permit. The aircraft special flight permit authorized the movement of the aircraft for certain maintenance; painting; and weighing to be performed. At slightly more than halfway [through the flight] the right gear box illuminated thus requiring the shutdown of the right engine. Due to the design of the accessory gearbox system; if the accessory gearbox loses a sufficient amount of lubricating oil; the abnormal procedures checklist requires that engine to be shut down to protect the integrity of the engine (although there is nothing inherently wrong with the engine). The usual culprit in such a situation is a low amount of oil in the gearbox itself. After being radar vectored to a nearby airport; we landed without incident and complied with the required reporting procedures of the airport. During the post flight inspection; there was no ascertainable evidence of leaking oil in or around the affected gearbox area. Prior to departing for the original destination; all engine and accessory gear boxes were checked and found to contain sufficient amounts of oil both prior to flight and subsequent to the recently performed engine ground runs. I then checked with our Maintenance Supervisor (who had acquired the special flight permit from the local FSDO). Our Maintenance Supervisor advised us on how to remedy this problem (which amounted to putting three quarts of oil into the gearbox). Our Maintenance Supervisor further advised us that we were authorized to continue on this ferry flight notwithstanding our intermediary stop. At that point we continued on to our original destination and landed without further incident. Upon post flight; the affected gear box showed no signs of leaking oil; and the oil dipstick showed more than a sufficient quantity for flight operations.

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.