Lead maintenance technician reported that a main rotor mast and transmission were improperly indexed...

Attributes
ACN	1690664
Time
Date	201910
Local Time Of Day	1201-1800
Aircraft 1
Make Model Name	Jet/Long Ranger/206
Operating Under FAR Part	Part 91
Flight Phase	Parked
Component
Aircraft Component	Helicopter Gearbox and Drive
Person 1
Function	Lead Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Experience	Maintenance Lead Technician 3 Maintenance Technician 6
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

While performing a transmission and mast replacement on aircraft; the maintenance technicians were installing the drive link collar set onto the splines of the main rotor mast. Following procedures in the bell maintenance manual 206l4 chapter 6; paragraphs 1-7 we found that the collar was not positioned correctly. The technicians then read the instructions again and realigned the collar set so that it was correctly installed. It was inspected and the splines were engaged per the manuals instructions. From that point maintenance resumed without error and the safety and security checks were performed.

Original NASA ASRS Text

Title: Lead Maintenance Technician reported that a main rotor mast and transmission were improperly indexed during installation and required corrective maintenance action.

Narrative: While performing a transmission and mast replacement on aircraft; the maintenance technicians were installing the drive link collar set onto the splines of the main rotor mast. Following procedures in the Bell Maintenance Manual 206L4 Chapter 6; paragraphs 1-7 we found that the collar was not positioned correctly. The technicians then read the instructions again and realigned the collar set so that it was correctly installed. It was inspected and the splines were engaged per the manuals instructions. From that point maintenance resumed without error and the safety and security checks were performed.

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.

Lead maintenance technician reported that a main rotor mast and transmission were improperly indexed during installation and required corrective maintenance action.