1AD/F27/145 - Engine Nacelle Fuel Line Inspection

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Fokker F27 Series Aeroplanes

AD/F27/145 Engine Nacelle Fuel Line Inspection 1/98

Applicability: All Model Fokker F27 Mk100 through Mk 700 series aeroplanes, all serial numbers.

Requirement: 1. Inspect the forward fuel feed lines P/N F471-27-1 or P/N F252-27-1 (RH Nacelle) and P/N F470-27-1 or P/N F152-27-1 (LH Nacelle), located at frame STA.3038, for damage in accordance with Part 1 of the Accomplishment Instructions of Fokker Service Bulletin (SB) F27/28-62 dated September 1, 1997 or a later RLD approved revision. If damage is found proceed with paragraph (2) of these requirements. If no damage is found proceed with paragraph (3) of these requirements.

2. If any fuel line is found to be damaged, accomplish one of the following:

(a) If the depth of the damage exceeds 0.009 inch, replace the affected fuel line with an airworthy part of the same part number.

(b) If the depth of the damage is less than 0.009inch, re-inspect the affected fuel line at every daily inspection thereafter and replace the affected fuel line with an airworthy part of the same part number within the next 50 flight hours following detection.

3. Modify the routing and support of the High Tension leads of the Inboard Ignition units in accordance with Part 2 of the Accomplishment Instructions of Fokker SB F27/28-62 dated September 1, 1997 or a later RLD-approved revision.

Note: RLD BLA 1997-094(A) dated September 1997 refers.

Compliance: 1. Within six months of the effective date of this directive.

2. (a) Before Next Flight.

(b) Inspect at every daily inspection and replace within 50 flight hours of discovery.

3. Within six months of the effective date of this directive.

This airworthiness directive becomes effective on 1 January 1998.

Background: An operator reported a fuel leak which was found to originate from a hole in the forward fuel feed line, Part No. F471-27-1, located at nacelle frame STA.3038. The damage to the pipe was found to be caused by interference between the nearby Ignition Unit High Tension leads and the fuel feed line. At least one of the ignition leads appeared to be incorrectly supported, resulting in chafing and damage to the fuel feed line. If uncorrected this condition could lead to significant loss of fuel and/or nacelle fire. This directive introduces an inspection of the fuel feed lines, replacement of damaged fuel feed components and re-routing of the affected high tension leads.