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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

(Docket No. FAA-2008-I098; Directorate Identifier 2008-NM-I08-AD(

RlN 2120-AA64

Ainvorthiness Directives; The Boeing Company Model 747-100,747-1 OOB,

747-100B SUO, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP Series

Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of cammel

period.

SUMMARY: We are revising an earlier proposed airworthiness directive (AD) for

certain Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F,

747-300, 747SR, and 747SP series airplanes. The original NPRM would have required

adding two new indicator lights on the PID panel to inform the captain and first officer 0

a low pressure condition in the left and right override/jettison pumps of the center wing

tanks. The original NPRM would also have required replacing the left and right

override/jettison switches on the M154 fuel control module on the P4 panel with

improved switches and doing the associated wiring changes. The original NPRM would

have also required a revision to the maintenance program to incorporate airworthiness

limitation No. 28-AWL-22. The original NPRM resulted from fuel system reviews

conducted by the manufacturer. This action revises the original NPRM by adding a

revision to the airplane flight manual to advise the flightcrew what 10 do in the event th

the pump low pressure light on the flight engineer's panel does not illuminate when the

pump is selected off; and requiring, for certain airplanes, installation of a mounting

bracket for the new indicator lights. We are proposing this supplemental NPRM to

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the pump low pressure light on the flight engineer's panel does not illuminate when the

pump is selected off; and requiring, for certain airplanes, installation of a mounting

bracket for the new indicator lights. We are proposing this supplemental NPRM to

limitation No. 28~AWL-22. The original NPRM resulted from fuel system reviews

conducted by the manufacturer. This action revises the original NPRM by adding a

revision to the airplane flight manual to advise the flightcrew what to do in the event th

have also required a revision to the maintenance program to incorporate airworthiness

improved switches and doing the associated wiring changes. The original NPRM would

adding two new indicator lights on the PID panel to inform the captain and first officer

a [ow pressure condition in the left and right override/jettison pumps of the center wing

747-300, 747SR, and 747SP series airplanes. The original NPRM would have required

Federal Aviation Administration

Ainvorthiness Directives; The Boeing Company Model 747-100, 747-100B,

certain Model 747-100, 747-1008, 747-1008 SUO, 747-2008, 747-200C, 747-200F,

[Docket No. FAA-2008-1098; Directorate Identifier 2008-NM-108-AD)

RIN 2120-AA64

Airplanes

AGENCY: Federal Aviation Administration (FAA), pOT.

ACTION: Supplemental no~ice of proposed rulemaking (NPRM); reopening of comme

747-1008 SUD, 747-2008, 747-200C, 747-200F, 747-300, 747SR, and 747SP Series

tanks. The original NPRM would also have required replacing the left and right

override/jettison switches on the Ml54 fuel control module on the P4 panel with

period.

SUM:MARY: We are revising an earlier proposed airworthiness directive (AD) for

14 CFR Part 39