Air Mobility Plan, 2008 - The Black Vault
Air Mobility Plan, 2008 - The Black Vault
Air Mobility Plan, 2008 - The Black Vault
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
C-5 Roadmap<br />
C-5 Program/Modifications<br />
(b)(5)<br />
Modification Explanations<br />
(b)(5)<br />
Horizontal Tie Box Replacement<br />
Because of the problems with the C-5A tie box, programmed depot maintenance (PDM) inspections<br />
track cracks in the C-5B horizontal stabilizer aft tie box fitting. <strong>The</strong> number and significance of the<br />
cracks has reached a point where the Tie Box program must transition from “inspect and repair” to<br />
“replace.” <strong>The</strong> A- and B-model tie boxes were both manufactured from 7075-T6 aluminum forgings.<br />
<strong>The</strong> 7075-T6 is known as a Stress Corrosion Crack (SCC) susceptible alloy. <strong>The</strong> tie box is not<br />
fail-safe for limit load for a crack beyond the critical crack length. Limit load is the maximum load<br />
that any aircraft in the fleet would see during the service life of the fleet. <strong>Plan</strong>s are to implement<br />
54<br />
FOR OFFICIAL USE ONLY (FOUO)<br />
OCT 07
Change language