i4910-13-PJ

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration • NCVRR~"US O\ITIN('; S~I1BOL 14CFR Part 39 #I()\- 

## /1-+ [DOC:~:5tAA-2008-0981; Directorate Identifier 

### 2008-NM~073-ADj Amcndmen 

# 3Jte.;AD*~,)O/O-14-()7 RlN 2120-AA64 Ainvorthiness Directivesj The Boeing Company Model 747 Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). 

# .., .j/'~/IO ~~, (f\'I [2.0 

### 1t0) Nm~I..SIS1G 

# I_ 

# li 

# -~HCl oun N S'(l1llOL 

## flf

inner chord and reinstalling the terminating modification. For airplanes that are convert new repetitive inspeclions, aninterim modification, andpost-interim modification

. . F .. I I· AD . I· . I . d 

### ft 

# 7z&,0 inspectIOns. or certam alfp anes, tl1S requues rep acmg any prevIOus y repmre a OVTING SYI16<X



# -7

this new AD also requires certain inspections ofthe upper aft outer chords and diagonal tothe Model 747-400 large cargo freighter CLeF) configuration, this new AD reduces t threshold and repeat intervals ofcertain post-modification inspections. For all airplanes, those actions using revised selV'iceinfonnation. For certain airplanes, this AD requires post-modification inspection ofthe modified area. This new AD continues to require currently requires aterminating modification for the repetitive inspections and a

brace attachment fittings, flanges, and rods to continue after the terminating modificatioJ .m 111i5 AD results from reports ofcracked aft inner chords on airplanes after certain requirements ofthe existing AD were done. We are issuing this AD to prevent fatigu cracking ofthe BS 2598 bulkhead structure, which could result in inability ofthe If)DEPARTMENT OF TRANSPORT ATION

Federal Aviation Administration 14910-13-PJ
1 OtlCI)II.'U:NCt'S OUTING SYMBOl 14CFR Part 39 

### .' J ;-<IU tit- I: lDocket No. FAA-2008-0981; Directorate Identifier 2008-NM-073-AD; Amendmen INJl1AJ.5/SlG

. " c..... H,;>"'b,s,vJ..) 39-**; AD **1 RlN 2120-AA64 Ainvorthiness Directives; The Boeing Company Model 747 Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). ACTION: Final rule. N[1~SlG 

## , L-,"'-
currently requires aterminating modification forthe repetitive inspections and a post~modification inspection ofthe modified area. This new AD continues torequire those actions using revised service information. For certain airplanes, this AD requires

this new AD also requires certain inspections ofthe upper aft outer chords and diagonal brace attachment fittings, flanges, and rods tocontinue after the terminating modificatio This AD results from reports ofcracked 'aftinner chords on airplanes after certain new repetitive inspections, an interim modification, and post-interim modification 

# rT • inspections. For certain airplanes, this AD requires replacing any previously repaired aft 

## OUTlHG74" inner chord and reinstalling the terminating modification. For airplanes that are convert 

# -IJ tothe Model 747-400 large cargo freighter (LeF) configuration, this new AD reduces t 

# "7ltffW~ '" threshold and repeat intervals ofcertain post-modification inspections. For all airplanes, 

# Ib /It i 0 .rNG SYMB<)l 

# r'~"" requirements ofthe existing AD were done. We are issuing this AD to prevent fatigue "'fllAlSISIG cracking ofthe BS 2598 bulkhead structure, which could result in inability ofthe 

## I 

# r I