AD 98-13-08

This amendment adopts a new airworthiness directive (AD) that applies to certain Pilatus Aircraft Ltd. (Pilatus) Model PC-12 airplanes. This AD requires replacing and re-routing the power return cables on the starter generator and generator 2, inserting a temporary revision to the pilot operating handbook (POH), and installing a placard near the standby magnetic compass. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by this AD are intended to prevent directional deviation on the standby magnetic compass caused by an overload of electrical current in the airplane structure, which could result in flight-path deviation during critical phases of flight in icing conditions and instrument meteorologic conditions (IMC).

Final rule.

98-13-08 PILATUS AIRCRAFT LTD.: Amendment 39-10596; Docket No. 97-CE-08-AD.

Applicability: Model PC-12 airplanes, serial numbers 101 through 147, certificated in any category.

NOTE 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (f) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Compliance: Required within the next 100 hours time-in-service (TIS)after the effective date of this AD, unless already accomplished.

To prevent directional deviation on the standby magnetic compass caused by an overload of electrical current in the airplane structure, which could result in flight-path deviation during critical phases of flight in icing conditions and Instrument Meteorologic Conditions (IMC), accomplish the following:

(a) Re-route and replace the starter generator cable and the generator 2 power return cables with new cables of improved design in accordance with the Accomplishment Instructions section in Pilatus PC XII Service Bulletin (SB) No. 24-002, Rev. No. 1, dated September 20, 1996.

(b) Remove the temporary revision titled "Electrical Cables," dated March 7, 1996, from the Pilot Operating Handbook (POH) and insert a temporary revision titled "Electrical Cables" Rev. 1, dated July 12, 1996, in accordance with the Accomplishment Instructions section in Pilatus PC XII SB No. 24-002, Rev. No. 1, dated September 20, 1996.

(c) Install a placard with the following words (using at least 1/8-inch letters) near the standby magnetic compass in accordance with the Accomplishment Instructions section in Pilatus PC XII SB No. 24-002, Rev. No. 1, dated September 20, 1996:

"STANDBY COMPASS
FOR CORRECT READING CHECK:
WINDSHIELD DE-ICE LH & RH HEAVY
& COOLING SYSTEM OFF."

(d) Incorporating the POH revisions and installing a placard, as required by paragraphs (b) and (c) of this AD, may be performed by the owner/operator holding at least a private pilot certificate as authorized by section 43.7 of the Federal Aviation Regulations (14 CFR 43.7), and must be entered into the aircraft records showing compliance with this AD in accordance with section 43.9 of the Federal Aviation Regulations (14 CFR 43.9).

(e) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished.

(f) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Small Airplane Directorate, 1201 Walnut, suite 900, Kansas City, Missouri 64106. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Small Airplane Directorate.

NOTE 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Small Airplane Directorate.

(g) Questions or technical information related to Pilatus PC XII SB No. 24-002, Rev. No. 1, dated September 20, 1996, should be directed to Pilatus Aircraft Ltd., Customer Liaison Manager, CH-6370 Stans, Switzerland; telephone: +41 41 6196 233; facsimile: +41 41 6103 351. This service information may be examined at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106.

(h) The modification, replacement, insertion, and installation required by this AD shall be done in accordance with Pilatus PC XII Service Bulletin No. 24-002, Rev. No. 1, dated September 20, 1996. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Pilatus Aircraft Ltd., Customer Liaison Manager, CH-6370 Stans, Switzerland. Copies may be inspected at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC.

NOTE 3: The subject of this AD is addressed in Swiss AD No. HB-96-140, dated March 18, 1996, and Swiss AD No. HB 97-001, dated January 1, 1997.

(i) This amendment becomes effective on July 31, 1998.

Events
Leading to the Issuance of This AD
A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an AD that would apply to certain Pilatus Model PC-12 airplanes was published in the Federal Register as a notice of proposed rulemaking (NPRM) on April 1, 1998 (63 FR 15795). The NPRM proposed to require replacing and re-routing the power return cables on the starter generator and generator 2; inserting a temporary revision to the POH; and installing a placard near the standby magnetic compass, using at least 1/8-inch letters, with the following words:

"STANDBY COMPASS FOR CORRECT READING CHECK: WINDSHIELD DE-ICE LH & RH HEAVY & COOLING SYSTEM OFF."

Accomplishment of the proposed action as specified in the NPRM would be in accordance with Pilatus PC XII Service Bulletin No. 24-002, Rev. No. 1, dated September 20, 1996.

The NPRM was the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland.

Interested persons have been afforded an opportunity to participate in the making of this amendment. No comments were received on the proposed rule or the FAA's determination of the cost to the public.

The FAA's Determination
After careful review of all available information related to the subject presented above, the FAA has determined that air safety and the public interest require the adoption of the rule as proposed except for minor editorial corrections. The FAA has determined that these minor corrections will not change the meaning of the AD and will not add any additional burden upon the public than was already proposed.

Cost Impact
The FAA estimates that 40 airplanes in the U.S. registry will be affected by this AD, that it will take approximately 12 workhours per airplane to accomplish the cable re-routing and replacement, and that the average labor rate is approximately $60 an hour. Parts will be provided free from the manufacturer upon request. Incorporating the POH revisions and installing a placard may be performed by the owner/operator holding at least a private pilot certificate as authorized by section 43.7 of the Federal Aviation Regulations (14 CFR 43.7), and must be entered into the aircraft records showing compliance with this AD in accordance with section 43.9 of the Federal Aviation Regulations (14 CFR 43.9).

Based on these figures, the total cost impact of this AD on U.S. operators is estimated to be $28,800, or $720 per airplane.

Regulatory Impact
The regulations adopted herein will not have substantial direct effects 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, in accordance with Executive Order 12612, it is determined that this final rule does not have sufficient federalism implications to warrant the preparation of a Federalism Assessment.

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 copy of the final evaluation prepared for this action is contained in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption "ADDRESSES".

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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:

PART 39 - AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.

39.13 [Amended]
2. Section 39.13 is amended by adding a new airworthiness directive (AD) to read as follows: