(4910-13-V)

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR ParI 39 IDoc~et No. FAA-2009-0655; Directorate Identifier 2008-NM-i92-ADj Amendment 39- 

## I(,-h I

. **'AD**I - (lie 

### CI -(- 1 l .--

_ • ~ RIN 2120-AA64 Ain"orthiness Directives; Boeing Model 747-200F, 747-200C, 747-400, 747-400D, and 747-400F Series Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT), ACTION: Final rule. SUMMARY: The FAA is superseding an existing airworthiness directive (AD), which applies toall Boeing Model 747-200F, 747-200C, 747-400, 747-400D, and 747-400F series airplanes. That AD cun-ently requires repetitive inspections forcracking ofcertain fuselage internal structure (i.e., Sections 42 and46 fuselage frames, upper deck floor beams, electronic bay access door cutout, nose wheel well, and main entry doors and door cutouts), and repair ifnecessary. This new AD reqLLires additional repetitive 1Jlspections forcracking ofcertain fuselage structure (i.e., Section 41 fuselage frames where they connect to upper deck floor beams, and section 41 fuselage frames between stringer (S-8 and S-12), and related investigative/corrective actions ifnecessary. This AD also reduces the inspection threshold and repetitive inspection intervals forcertain airplanes. This AD results from fatigue tests and analysis by Boeing that identifIed additional areas ofthe fuselage where fatigue cracks can occur. We aTeissuing this AD to prevent the loss of structural integrity of the fuselage, which could result inrapid depressurization ofthe airplane. '(I~(lI"",-,~('l"; "fll)",,~r;."-""0'

'''Tl \l '"''


### A-;Jhl ;IL-- ~nIAL5 'R, 

# i/J)~~ /I. Ie LI(4910-I3-UI

IlEPAIHMENT OF TRANSPORT AnON Federal Aviation Administration 14CFR Part 39 .ONCVl<R"'Kf.S ROVTlNGsn'BOl

RIN 2120-AA64 "mALSlS1G IDocket No. FAA-2009-0655; Directorate Identifier 2008-NM-192-ADj Amendment 

## D.

# Pw ., ( 39-"*; AD 

## **J A1'i

## n-IZIP ill •. 

### <;. Airworthiness Directives; Boeing Model 747~200F, 747-200C, 747-400, 747-4000, an

# rm.r:s1li '
747-400F Series Airplanes 

# '9:25

-0

## 'i AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). ACTION: Final rule. SUMMARY: The FAA is superseding anexisting airworthiness directive (AD), which applies to all Boeing Model 747-200F, 747-200C, 747-400, 747-400D, and 747-400F 

## A"'~m1 f1..(, INlTI"l.S/SIG series airplanes. That AD currently requires repetitive inspections forcracking ofcertai m fuselage internal structure (i.e., Sections 42 and 46 fuselage frames, upper deck floor beams, electronic bay access door cutout, nose wheel well, and main entry doors and door cutouts), and repair ifnecessary. This new AD requires additional repetitive inspections forcracking ofcertain fuselage structure (i.e., Section 41 fuselage frames where they connect to upper deck floor beams, and section 41 fuselage frames behveen stringer (S-8 and S-12), and related investigative/corrective actions ifnecessary. This A also reduces the inspection threshold and repetitive inspection intervals forcertain airplanes. This AD results fTomfatigue tests and analysis by Boeing that identified additional areas ofthe fuselage where fatigue cracks can occur. We are issuing this AD toprevent the loss ofstructural integrity ofthe fuselage, wh.ichcould result inrapid depressurization ofthe airplane. 

### . ~ ';"-'u-_ PATE 

## 17 1'"""' "i 2I\.( 

## vl
OU NGSYMllOl

NlnALSlSlG

OlfT1"G SYMBOL-

'Nll1Al5/SIG14910-13-UI

DEPARTMENT OFTRANSPORTATION Federal Aviation Administration 14CFR Part 39 ~ONCVROU"ICES OurlNGS'l'I~Ol

"'fT1AI..SISIG (Docket No. FA..t\.-2009-0655; Directorate Identifier 2008-NM-192-AD; Amendment 

## l';L r:.. 39-**; AD **1 RIN 2120-AA64 n~ sYY-ilOl. Ah...' :-;t~I'L Ainvorthiness Directives; Boeing Model 747-200F, 747~200C. 747-400. 747-4000, an

# 'Nll~L' _.;--J" 747-400F Series Airplanes "0£ 

## 9-2~- C" AGENCY: Federal Aviation Administration (FAA). Depanment ofTransportation (DOT). ACTION: Final rule. SUMMARY: The F.A...A is superseding anexisting airworthiness directive (AD). which applies to all Boeing Model 747-200F, 747-200C, 747-400, 747-4000, and 747-400F series airplanes. That AD cun-enily requires repetitive inspections forcracking ofcertai fuselage internal structure (i.e., Sections 42 and 46 fuselage frames, upper deck floor beams, electronic bay access door cutout, nose wheel well. and main entry doors and door cutOUI's),

and repair ifnecessary. This new AD requires additional repetitive inspections for cracking ofcertain fuselage structure (i.e., Section 41 fuselage frames where they connect to upper deck floor beams, and section 41 fuselage frames between stringer (S-8 and S-12), and related investigative/corrective actions ifnecessary. This A also reduces the inspection threshold and repetitive inspection intervals forcertain airplanes. This AD results from fatigue tests and analysis by Boeing that identified additional areas ofthe fuselage where fatigue cracks can occur. We arc issuing this AD to prevent the loss of structural integrity ofthe fuselage. which could result inrapid depressurization ofthe airplane. ,~>.... ') l).O.~.-\.v-

•.• ' '- ftJ.~mllL( 

## 7' !SIG

OUTlNG SYMBOL

mnAtSIS1G

OUTING SYM&lL

mnAlS/SIG

OUTING SYM5Ol.

'Nrn.>l.5ISIG