# AD 2001-18-03: Fuel Differential Pressure Switches - Type: Airworthiness directive - Status: Current - Products: Fokker Services F27 Mark 100, F27 Mark 200, F27 Mark 300, F27 Mark 400, F27 Mark 500, F27 Mark 600 and F27 Mark 700 - Effective: October 11, 2001 - Published: September 6, 2001, 66 FR 46510–46512 - Issued: August 27, 2001 - Issued as: Final rule - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-12429 - Docket: 2001-NM-24-AD - Official PDF: https://openairdocs.org/files/sha256/1a/d6/1ad62843270dec698df351058127dc31c786762b906e02f5e75f41936f2be32c (from https://www.govinfo.gov/content/pkg/FR-2001-09-06/pdf/01-22086.pdf) - Federal Register: https://www.federalregister.gov/documents/2001/09/06/01-22086/airworthiness-directives-fokker-model-f27-mark-100-200-300-400-500-600-and-700-series-airplanes - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D128973D50B9916186256ABF00598612.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/2001-18-03 ## Summary This amendment adopts a new airworthiness directive (AD), applicable to all Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes, that requires a one-time inspection for correct installation of the left- and right-hand fuel differential pressure (FDP) switches and for correct connection of the pressure sensing lines to the switches, and corrective action, if necessary. The actions specified by this AD are intended to ensure that a warning light goes on when the fuel filter is partially blocked by ice, so that the blockage of the fuel filter does not increase, leading to reduced fuel flow to the engine and possibly to an engine flame-out. This action is intended to address the identified unsafe condition. ## The airworthiness directive ### Adoption of the Amendment Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: 1. The authority citation for part 39 continues to read as follows: ## Rule preamble ### Dates Effective October 11, 2001. The incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of October 11, 2001. ### Addresses The service information referenced in this AD may be obtained from Fokker Services B.V., P.O. Box 231, 2150 AE Nieuw-Vennep, the Netherlands. This information may be examined at the Federal Aviation Administration (FAA), Transport Airplane Directorate, Rules Docket, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. ### For further information contact Dan Rodina, Aerospace Engineer, International Branch, FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone (425) 227-2125; fax (425) 227-1149. ### SUPPLEMENTARY INFORMATION A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an airworthiness directive (AD) that is applicable to all Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes was published in the Federal Register on June 27, 2001 (66 FR 34134). That action proposed to require a one-time inspection for correct installation of the left- and right-hand fuel differential pressure (FDP) switches and for correct connection of the pressure sensing lines to the switches, and corrective action, if necessary. ### Comments Interested persons have been afforded an opportunity to participate in the making of this amendment. Due consideration has been given to the single comment received. ### Cite Foreign Airworthiness Directive The commenter states that the Dutch airworthiness directive is not cited in the proposed rule, and asks that it be included in the final rule. The FAA agrees with the commenter in that the note citing the Dutch airworthiness directive was inadvertently omitted from the proposed rule. We have added the note to this final rule accordingly. ### Conclusion After careful review of the available data, including the comment noted above, the FAA has determined that air safety and the public interest require the adoption of the rule with the change described previously. The FAA has determined that this change will neither increase the economic burden on any operator nor increase the scope of the AD. ### Cost Impact The FAA estimates that 44 airplanes of U.S. registry will be affected by this AD, that it will take approximately 1 work hour per airplane to accomplish the required one-time inspection, and that the average labor rate is $60 per work hour. Based on these figures, the cost impact of the AD on U.S. operators is estimated to be $2,640, or $60 per airplane. The cost impact figure discussed above is based on assumptions that no operator has yet accomplished any of the requirements of this AD action, and that no operator would accomplish those actions in the future if this AD were not adopted. The cost impact figures discussed in AD rulemaking actions represent only the time necessary to perform the specific actions actually required by the AD. These figures typically do not include incidental costs, such as the time required to gain access and close up, planning time, or time necessitated by other administrative actions. ### Regulatory Impact The regulations adopted herein will not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government. Therefore, it is determined that this final rule does not have federalism implications under Executive Order 13132. For the reasons discussed above, I certify that this action (1) is not a “significant regulatory action” under Executive Order 12866; (2) is not a “significant rule” under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. A final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it may be obtained from the Rules Docket at the location provided under the caption ADDRESSES. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A-817](https://openairdocs.org/tcds/A-817): Fokker Services B.V.; names 7 of 8 models: F27 Mark 500, F27 Mark 100, F27 Mark 700, F27 Mark 200, F27 Mark 400, F27 Mark 600, F27 Mark 300 ## Registered aircraft it may apply to (OpenAirDocs) No registered aircraft matched the models it names. ## Related documents - [Proposed rule 2001-NM-24-AD](https://openairdocs.org/proposed/2001-NM-24-AD): Notice of proposed rulemaking (NPRM), published Jun 27, 2001 Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.