[CPSONE]

Searched the forums and coudn't find anything on numbers being stamped on
aluminum angle by the factory. Anyone know what these mean? Should I replace the angle? It's on the angle under the down rudder stop plate, between the HS attach bars on the rear fuse deck. (Angle is not curved, camera lens...)

 

[Mel]

Have no idea what the numbers mean, but they won't hurt anything. Build On!

 

[aerhed]

Van is a 93rd degree Mason. Those are secret numbers that will guide you to the national teasure.

 

[CPSONE]

Nickname

maybe it's it's name...
'Ole '75...
What other secret numbers lurk beneath...
Could be the month and year of the build july 2005?
Should be able to see if others have similar stamped numbers but you'd need an inspection cam or mirror. Bet you all the QB''s have them. It's on the bottom of F-711D angle. Christmas wish list...Inspection cam!
(and thanks Mel)

 

[shuttle]

Never seen that before. Could it be 7075 grade aluminium?

See description here: http://www.aircraftspruce.com/catalog/mepages/aluminfo.php

 

[David Paule]

I've never seen the grade stamped on the metal - there are sound engineering reasons why that is. The mills print it on, usually in blue ink.

Dave