### (4910-13-P]

Airworthiness Directives; The Boeing Company Model 737-600, -700, -70De, -800, RIN 2120-AA64 Federal Aviation Administration SCURRI;."<CES 1l'G5\"lo"'Ol 

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# 0%5'6 IDocket No. FAA-2010-++++j Directorate Identifier 20JO-NM-l 83-AD] 14CFR Part 39

-900, and -90GER Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. DEPARTMENT OF TRANSPORTATION

ACTION: Notice ofproposed rulemaking (NP.RM). SUMl\'lARY: Wepropose to adopt anew airworthiness directive (AD) for certain Mod ~A1 

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### 737-600, -700, -70De, 

### -800, -900, and -90GERseries airplanes. This proposed ADwou d ~,"...u.SlG 

### require modifying lhe thrust reverser inner walls, inspecting fordamage ofthe upper an lower inner wall insulation blankets, measuring the electrical conductivity on the 1IT1"';; S,""'OOL 

### aluminum upper compression pads 2 and 3 as applicable, inspecting fordiscrepancies 0 

### tbe inner wall ofthe thrust reverser, and corrective actions ifnecessary. This proposed AD would also require, forcertain airplanes, d~ing various concunent actions (includin ,,'r. ,I. .OLJTlNGS"MOOI. 

### replacing the inner wall blanket insulation, installing updated full-authority digital I NITlA!..SISIG 

### electronic control software, and modifying the thrust reverser inner wall and insulation I - 

### blankets). This proposed AD results from repors ofheat damage to the inner wall ofth OU'TIOl(; S\""""~ 

### thrust reversers. We are proposing this AD todetect and correct such heat damage, which could result in separation ofadjacent components and consequent structural Nrn"LSSlG 

### damage to the airplane, damage to other airplanes, and injury topeople on the ground. DATES: We must receive comments on this proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:

• Federal eRulemaking Portal: Go tohJp:I/www.regUlutions.gOv. Follow the14910-13-PI DEPARTMENT OF'TRANSPORTATION Federal Aviation Administration 14eFR Part 39 :OHCUH!\fNCES 0I1T1>IG SYt<&OL 

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# W«I-lu5 IDocket No. FAA-2010-++++; Dir«torate Identifier 2010-NM-183-AD} RIN 2120-AA64 Airworthiness Directh'es; The Boeing Company Model 737-600, -700, -700c, -800, -900, and -900ER Series Airplanes { 

### D AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew ain'lorthiness directive (AD) for certain Model 737-600, -700, -700e, -800, -900, and -900ER series airplanes. This proposed AD would require modifying the thrust reverser inner walls, inspecting fordamage ofthe upper and lower inner wall insulation blankets, measuring the electrical conductivity on the aluminum upper compression pads 2and 3 as applicable, inspecting fordiscrepancies of the inner wall ofthethrust reverser, and corrective actions ifnecessary. This proposed AD would also require, forcertain airplanes, doing various concurrent actions (including replacing the inner wall blanket insulation, installing updated full-authority digital electronic control software, and modifying thethrust reverser inner wall and insulation blankets). This proposed AD results from reports ofheat damage to the inner wall or the thrust reversers. We are proposing this AD to detect and correct such heat damage, which could result in separation of adjacent components and consequent structural damage tothe airplane, damage to other airplanes, andinjury to

# lpeople onthe ground. DATES: Wemust receive comments on this proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLlCAT10N IN THE FEDERAl!, REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:

• Federal eRulemaking Portal: Go tohttp://w.vw.rc!!.ulations.!!.ov. Follow the I'i 10 oun<lGsy BOl A
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