Any Unknown or Unlisted Aircraft Manufacturer
Maintenance Airframe; Maintenance Powerplant
Fatigue
Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Aircraft Damaged; General Maintenance Action
Aircraft; Human Factors; Manuals; Procedure
Installation of the RH Nose Landing Gear Door bumper on Aircraft X. After installing the bumper I went back to check that the bumper was secured to door stop. I moved the center control rod out several times checking the bumper security. After being informed on [date] that the aircraft had a returned flight due to the nose gear door problems; I am unsure at this time if the maintenance action I preformed was a factor in to the return to field event.This incident happened during the COVID-19 crisis. After being off for several weeks on a normal sleep routine. We were asked to return to work on a limited and staggered work schedule. I was off work approximately 8 weeks prior. This situation caused me to be off work and on a normal sleep schedule and then returning to work for one day on a night shift schedule. I could tell that I was fatigued due to the abnormal interruption of my circadian rhythm. The task I was performing has very limited instructions in the maintenance manual. I recommend a specific task be written to install just the rubber bumper on the nose gear door stop. These rubber bumpers frequently fall off and it is a common occurrence to replace them. I also noticed that the door stop on the nose landing gear doors can cause the nose gear door to appear open and locked when in fact the over-center linkage of the door is not in its locked position. This could potentially cause a sequence issue during door operation. This situation can be easily missed.
Mechanic reported that after performing work on the nose gear door; the aircraft had nose gear problems in flight. Mechanic was concerned that fatigue due to changes in work schedule hours contributed to a possible error.