Source: https://www.federalregister.gov/documents/2006/12/28/E6-22282/airworthiness-directives-fokker-model-f28-mark-0070-and-0100-airplanes
Timestamp: 2018-03-20 14:05:20
Document Index: 645167324

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'art 2', 'art 2', 'art 1', 'art 1', 'art 1', 'art 2', 'art 1']

A Proposed Rule by the Federal Aviation Administration on 12/28/2006
We must receive comments on this proposed AD by January 29, 2007.
71 FR 78099
78099-78101 (3 pages)
Docket No. FAA-2006-26709
Directorate Identifier 2006-NM-202-AD
E6-22282
https://www.federalregister.gov/d/E6-22282 https://www.federalregister.gov/d/E6-22282
The FAA proposes to adopt a new airworthiness directive (AD) for all Fokker Model F.28 Mark 0070 and 0100 airplanes. This proposed AD would require inspecting the carbon-fiber reinforced plastic (CFRP) main landing gear (MLG) door to determine whether certain part numbers are installed. For airplanes having certain doors, this proposed AD would require inspecting the MLG outboard door for cracks, play, and loose sealant/bolts/nuts, and related investigative and corrective actions if necessary. This proposed AD would also require, for airplanes having certain doors, modifying the rod bracket attachment of the MLG outboard door. This proposed AD results from a report of a rod bracket of the MLG door detaching during flight. We are proposing this AD to detect and correct cracks in the rod bracket attachment bolts, which could result in the rod brackets detaching from the MLG door and blocking the proper functioning of the MLG.
We invite you to submit any relevant written data, views, or arguments regarding this proposed AD. Send your comments to an address listed in the ADDRESSES section. Include the docket number “FAA-2006-26709; Directorate Identifier 2006-NM-202-AD” at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments.
The Civil Aviation Authority—The Netherlands (CAA-NL), which is the airworthiness authority for the Netherlands, notified us that an unsafe condition may exist on Fokker Model F.28 Mark 0070 and 0100 airplanes equipped with certain carbon-fiber reinforced plastic (CFRP) main landing gear (MLG) doors. The CAA-NL reports that a rod bracket of the MLG door of a Model F.28 Mark 0070 airplane detached during flight. Investigation showed that the operating rod between the MLG outboard door and the MLG fitting was broken and the rod's bracket was detached from the outboard door. The affected parts subsequently got stuck between the MLG and the outboard door hinge, resulting in damage to the two adjacent hydraulic lines. An investigation of a similar event revealed an operating rod bracket broken loose from the CFRP MLG door. Several other operators have also reported finding partly detached operating rod brackets. This condition, if not corrected, could result in rod Start Printed Page 78100brackets detaching from the CFRP MLG outboard door and blocking the proper functioning of the MLG.
Fokker Services B.V. has issued Fokker Service Bulletin SBF100-52-080, dated December 12, 2005, including Fokker Manual Change Notification—Maintenance Documentation MCNM-F100-103, dated November 15, 2005.
In Part 1 of the Accomplishment Instructions of the service bulletin, the service bulletin describes procedures for doing a detailed inspection of the MLG outboard door for cracks, play, and loose sealant/bolts/nuts. The detailed inspection consists of the following actions:
Inspecting for any cracks in the CFRP skin of the MLG outboard door.
Inspecting for play between the countersunk bolt-heads and the CFRP outer skin.
Inspecting for cracks in the paint.
Inspecting for play between the operating rod bracket and the MLG outboard door.
Inspecting for loose sealant around the edges of the bracket and loose bolts and nuts.
Part 1 of the service bulletin also describes doing the following related investigative action if play is found or if there are any loose bolts/nuts: Inspecting the inside of the door for cracks in the CFRP outer skin at the bolt hole locations and/or checking for delamination by tapping.
Part 1 of the service bulletin also describes doing one of the following corrective actions if play is found, if there are any loose bolts/nuts, or if any crack is found: Contacting Fokker, operating under Configuration Deviation List (CDL) item 52-07 (“operating with MLG strut bay doors missing”) of the Fokker Appendix CDL, to Fokker 70/Fokker 100 Airplane Flight Manual (AFM), Version 06, Issue 010, or doing the modification of the MLG outboard door operating rod bracket attachment specified in Part 2 of the service bulletin.
Part 2 of the Accomplishment Instructions of the service bulletin describes procedures for modifying the MLG outboard door operating rod bracket attachment. The modification includes installing internal and external reinforcement plates, reidentifying the outboard MLG door, and doing the following related investigative actions and corrective actions:
Inspecting for damage of the operating rod bracket and operating rod.
If any damage is found, doing one of the following: contacting Fokker, operating under CDL item 52-07, or replacing damaged part with a new part.
Inspecting for cracks and and/or checking for delamination by tapping of the skin around the attachment holes.
If any crack or delamination is found, doing one of the following: Repairing the cracks or delamination, or contacting Fokker if any crack or delamination is found beyond 10 millimeters (mm) (0.040 inches) from the bolt holes.
Accomplishing the actions specified in the service information is intended to adequately address the unsafe condition. The CAA-NL mandated the service information and issued Dutch airworthiness directive NL-2006-001, dated January 5, 2006, to ensure the continued airworthiness of these airplanes in the Netherlands.
Paragraph B.(3) of Part 1 of the Accomplishment Instructions of the service bulletin specifies to inspect for loose sealant and paragraph B.(6) specifies to inspect for delamination. However corrective actions for those conditions are not specified in the service bulletin. This proposed AD would require doing the corrective action specified in paragraph C.(3) of the service bulletin if any loose sealant or delamination is found during any inspection specified in paragraph (g) of the proposed AD.
Inspections 2 $80 $0 $160 7 $1,120
Modification 6 80 1,066 1,546 7 10,822
We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, “General requirements.” Under that section, Congress charges the FAA with Start Printed Page 78101promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Fokker Services B.V: Docket No. FAA-2006-26709; Directorate Identifier 2006-NM-202-AD.
(a) The FAA must receive comments on this AD action by January 29, 2007.
(d) This AD results from a report of a rod bracket of the main landing gear (MLG) door detaching during flight. We are issuing this AD to detect and correct cracks in the rod bracket attachment bolts, which could result in the rod brackets detaching from the MLG door and blocking the proper functioning of the MLG.
(f) Within nine months after the effective date of this AD, inspect the carbon-fiber reinforced plastic (CFRP) MLG doors to determine if any MLG door having a part number (P/N) D13312-401 through -410 inclusive is installed. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number of the CFRP MLG doors can be conclusively determined from that review. If the CFRP MLG doors have any part number other than P/N D13312-401 through -410 inclusive installed, no further action is required by this AD.
(g) If any CFRP MLG door having any P/N D13312-401 through-410 inclusive is found during the inspection required by paragraph (f) of this AD: Within nine months after the effective date of this AD, do a detailed inspection of the MLG outboard door for cracks, play, and loose sealant/bolts/nuts as specified in Part 1 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-52-080, dated December 12, 2005, including Fokker Manual Change Notification—Maintenance Documentation MCNM-F100-103, dated November 15, 2005, and do all applicable related investigative and corrective actions, by doing all the applicable actions specified in Part 1 of the Accomplishment Instructions of the service bulletin, except as provided by paragraphs (i), (j), and (k) of this AD. Do all applicable related investigative and corrective actions before further flight.
(h) If any CFRP MLG door having any P/N D13312-401 through-410 inclusive is found during the inspection required by paragraph (f) of this AD: Within 12 months after the effective date of this AD, modify the MLG outboard door operating rod bracket attachment and do all applicable related investigative and corrective actions by doing all the applicable actions specified in Part 2 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-52-080, dated December 12, 2005, including Fokker Manual Change Notification—Maintenance Documentation MCNM-F100-103, dated November 15, 2005, except as provided by paragraph (i) of this AD. Do all applicable related investigative and corrective actions before further flight.
(i) Where Fokker Service Bulletin SBF100-52-080, dated December 12, 2005, including Fokker Manual Change Notification—Maintenance Documentation MCNM-F100-103, dated November 15, 2005, specifies to contact the manufacturer for repair, before further flight, repair using a method approved by either the Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA; or the European Aviation Safety Agency (EASA) (or its delegated agent).
(j) If any loose sealant or any delamination is found during any inspection required by paragraph (g) of this AD, before further flight, do the corrective action specified in paragraph C.(3) of Part 1 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-52-080, dated December 12, 2005, including Fokker Manual Change Notification—Maintenance Documentation MCNM-F100-103, dated November 15, 2005.
(m) Dutch airworthiness directive NL-2006-001, dated January 5, 2006, also addresses the subject of this AD.
Issued in Renton, Washington, on December 19, 2006.
[FR Doc. E6-22282 Filed 12-27-06; 8:45 am]