Boeing 777

This Engineering Authorization (EA) is issued to incorporate______. Currently, the Boeing 777’s rubstrips, located where the fairing meets the strut, do not have any wear limits. These rubstrips have been found to be very worn when they have been inspected, in some instances up to almost 80%. This EA is being created to establish a set of guidelines for when it is necessary replace these rubstrips. By creating this EA, it will allow us to also start creating wear limits on these rubstrips. This EA affects all s-CAL and s-UA 777 aircraft.
Action
Operation 1: Determining the wear on the rubstrip located on engine 1
1. Gain access to where the fairing and strut meet
2. Locate and identify the rubstrips
3. Measure any wear found on these rubstrips
4. If …show more content…
Locate and identify the rubstrips
3. Measure any wear found on these rubstrips
4. If wear is found, replace the rubstrip
R&R T of A
During the aircraft’s next C-check these rubstrips should be replaced. This EA is not time controlled. All operations must be accomplished at the same C-check.
Tech Substantiation
This EA creates a set of guidelines for replacing rubstrips on the 777. These rubstrips are located at near where the fairing and strut meet. The rubstrips are meant to protect other components of the aircraft from being damaged. When these rubstrips wear down, they can expose other components of the aircraft to damage, which could create a more costly issue to deal with. Currently, there are no wear life rates in place for these rubstrips. By checking on the rubstrips at the aircraft’s next C-check, it will allow for wear rates to be calculated.
Risk assessment
A risk assessment was performed per GMM 06-15-05 and the SMS manual. The risk classification for the inspection of these rubstrips shows limited risk. This area will be inspected per this EA and if damage is found it will be repaired prior to further flight. AD marking was considered but would be of no value.
Steps
Operation 1
Access