Lufthansa German Airlines

Document ID: FAA-2007-0308-0003
Document Type: Public Submission
Agency: Federal Aviation Administration
Received Date: January 17 2008, at 11:19 AM Eastern Standard Time
Date Posted: January 17 2008, at 12:00 AM Eastern Standard Time
Comment Start Date: December 11 2007, at 12:00 AM Eastern Standard Time
Comment Due Date: January 25 2008, at 11:59 PM Eastern Standard Time
Tracking Number: 8039cb3c
View Document:

This is comment on Rule

Airworthiness Directives; Boeing Model 747-100, 747-100B, 747- 100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, and 747SR Series Airplanes

View Comment

1. The existing attachment for each transmission with 3 solid Inconel bolts is a damage tolerant design. The new attachment with a double load path bolt is a fail safe design. A cracked hollow bolt could go undetected. This will be a great disadvantage of the proposed modified design. 2. The repeated overhaul of transmission units is not considered. DLH (executed) repeated overhaul of transmission units (every D check of the aircraft). This should be considered for transmission units with flight cycles greater than 20 000 cycles and allow to extend the accomplishment period to 6 years for repeated overhauled transmission units. Lutz Hitzig, Lufthansa German Airlines Frankfurt, Germany 2008, Feb. 17

Related Comments

View All

Total: 7

KLM Royal Dutch Airlines - Fleet Services
Public Submission Posted: 01/18/2008 ID: FAA-2007-0308-0004