Federal Aviation Administration, DOT.
Notice of proposed rulemaking (NPRM).
This document proposes to adopt a new airworthiness directive (AD) that would apply to all Pilatus Britten-Norman Ltd. (Pilatus Britten-Norman) BN-2, BN-2A, BN-2B, BN-2T, BN-2T-4, and BN2A MK. III series airplanes. This proposed AD would require you to repetitively inspect the throttle friction-shaft; and replace the shaft if damaged. This proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by this proposed AD are intended to detect and correct loosening of the throttle friction adjustment beyond its normal limits. Such a condition could lead to damage to the throttle friction-adjuster or the retaining washer and split pin. This could allow the throttle quadrant shaft to laterally shift and impede the operation of the engine controls.
The Federal Aviation Administration (FAA) must receive any comments on this proposed rule on or before December 10, 2001.
Submit comments to FAA, Central Region, Office of the Regional Counsel, Attention: Rules Docket No. 2000-CE-47-AD, 901 Locust, Room 506, Kansas City, Missouri 64106. You may view any comments at this location between 8 a.m. and 4 p.m., Monday through Friday, except Federal holidays.
You may get service information that applies to this proposed AD from Pilatus Britten-Norman Limited, Bembridge, Isle of Wight, United Kingdom PO35 5PR; telephone: +44 (0) 1983 872511; facsimile: +44 (0) 1983 873246. You may also view this information at the Rules Docket at the address above.Start Further Info
FOR FURTHER INFORMATION CONTACT:
Doug Rudolph, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4059; facsimile: (816) 329-4090.End Further Info End Preamble Start Supplemental Information
How Do I Comment on This Proposed AD?
The FAA invites comments on this proposed rule. You may submit whatever written data, views, or arguments you choose. You need to include the rule's docket number and submit your comments to the address specified under the caption ADDRESSES. We will consider all comments received on or before the closing date. We may amend this proposed rule in light of comments received. Factual information that supports your ideas and suggestions is extremely helpful in evaluating the effectiveness of this proposed AD action and determining whether we need to take additional rulemaking action.
Are There Any Specific Portions of This Proposed AD I Should Pay Attention to?
The FAA specifically invites comments on the overall regulatory, economic, environmental, and energy Start Printed Page 56249aspects of this proposed rule that might suggest a need to modify the rule. You may view all comments we receive before and after the closing date of the rule in the Rules Docket. We will file a report in the Rules Docket that summarizes each contact we have with the public that concerns the substantive parts of this proposed AD.
How Can I Be Sure FAA Receives My Comment?
If you want FAA to acknowledge the receipt of your comments, you must include a self-addressed, stamped postcard. On the postcard, write “Comments to Docket No. 2000-CE-47-AD.” We will date stamp and mail the postcard back to you.
What Events Have Caused This Proposed AD?
The Civil Airworthiness Authority (CAA), which is the airworthiness authority for the United Kingdom, recently notified FAA that an unsafe condition may exist on all Pilatus Britten-Norman BN-2, BN-2A, BN-2B, BN-2T, BN-2T-4, and BN2A MK. III series airplanes. The CAA reports an incident where the throttle friction adjuster loosened too far, causing the split pin and the washer on the shaft to break.
What Are the Consequences if the Condition is Not Corrected?
The loosening of the throttle friction adjustment beyond its normal limits could lead to damage to the throttle friction-adjuster or the retaining washer and split pin. This could allow the throttle quadrant shaft to laterally shift and impede the operation of the engine controls.
Is There Service Information That Applies to This Subject?
Pilatus Britten-Norman has issued Service Bulletin No. BN2/SB.272, Issue 1, dated July 1, 2000.
What Are the Provisions of This Service Bulletin?
The service bulletin includes procedures for:
—repetitively inspecting the throttle friction-shaft; and
—replacing the shaft if damaged.
What Action Did the CAA Take?
The CAA classified this service bulletin as mandatory and issued British AD Number 003-07-2000, dated August 22, 2000, in order to ensure the continued airworthiness of these airplanes in the United Kingdom.
Was This in Accordance With the Bilateral Airworthiness Agreement?
These airplane models are manufactured in the United Kingdom and are type certificated for operation in the United States under the provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement.
Pursuant to this bilateral airworthiness agreement, the CAA has kept FAA informed of the situation described above.
The FAA's Determination and an Explanation of the Provisions of This Proposed AD
What Has FAA Decided?
The FAA has examined the findings of the CAA; reviewed all available information, including the service information referenced above; and determined that:
—the unsafe condition referenced in this document exists or could develop on other Pilatus Britten-Norman BN-2, BN-2A, BN-2B, BN-2T, BN-2T-4, and BN2A MK. III series airplanes of the same type design;
—the actions specified in the previously-referenced service information should be accomplished on the affected airplanes; and
—AD action should be taken in order to correct this unsafe condition.
What Would This Proposed AD Require?
This proposed AD would require you to incorporate the actions in the previously referenced service bulletin.
How Many Airplanes Would This Proposed AD Impact?
We estimate that this proposed AD affects 118 airplanes in the U.S. registry.
What Would Be the Cost Impact of This Proposed AD on Owners/Operators of the Affected Airplanes?
We estimate the following costs to accomplish the proposed inspection:
|Labor cost||Parts cost||Total cost per airplane||Total cost on U.S. operators|
|1 work hour × $60 per hour = $60||$1||$61||$61 × 118 = $7,198.|
We estimate the following costs to accomplish any necessary replacements that would be required based on the results of the proposed inspection. We have no way of determining the number of airplanes that may need such replacement:
|Labor cost||Parts cost||Total cost per airplane|
|16 work hour × $60 per hour = $960||$230||$1,190|
Is There a Modification I Can Incorporate Instead of Repetitively Inspecting the Throttle Friction-Shaft?
The FAA has determined that long-term continued operational safety would be better assured by design changes that remove the source of the problem rather than by repetitive inspections or other special procedures. With this in mind, we will continue to work with Pilatus Britten-Norman in collecting information and in performing fatigue analysis to determine whether a future design change may be necessary.
Would This Proposed AD Impact Various Entities?
The regulations proposed herein would 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 proposed rule would not have federalism implications under Executive Order 13132.
Would This Proposed AD Involve a Significant Rule or Regulatory Action?
For the reasons discussed above, I certify that this proposed 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) if promulgated, 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 draft regulatory evaluation prepared for this action has been placed in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption ADDRESSES.Start List of Subjects
List of Subjects in 14 CFR Part 39
- Air transportation
- Aviation safety
The Proposed Amendment
Accordingly, under the authority delegated to me by the Administrator, Start Printed Page 56250the Federal Aviation Administration proposes to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:Start Part
PART 39—AIRWORTHINESS DIRECTIVESEnd Part Start Amendment Part
1. The authority citation for part 39 continues to read as follows:End Amendment Part
2. FAA amends § 39.13 by adding a new airworthiness directive (AD) to read as follows:End Amendment Part
PILATUS BRITTEN-NORMAN LTD.: Docket No. 2000-CE-47-AD
(a) What airplanes are affected by this AD? This AD affects the following Model BN-2, BN-2A, BN-2A-2, BN-2A-3, BN-2A-6, BN-2A-8, BN-2A-9, BN-2A-20, BN-2A-21, BN-2A-26, BN-2A-27, BN-2B-20, BN-2B-21, BN-2B-26, BN-2B-27, BN-2T, BN-2T-4R, BN2A MK. III, BN2A MK. III-2, and BN2A MK. III-3 airplanes, all serial numbers, that are certificated in any category.
(b) Who must comply with this AD? Anyone who wishes to operate any of the above airplanes must comply with this AD.
(c) What problem does this AD address? The actions specified by this AD are intended to detect and correct loosening of the throttle friction adjustment beyond its normal limits. Such a condition could lead to damage to the throttle friction-adjuster or the retaining washer and split pin. This could allow the throttle quadrant shaft to laterally shift and impede the operation of the engine controls.
(d) What actions must I accomplish to address this problem? To address this problem, you must accomplish the following:
|(1) Inspect the throttle friction-shaft for damage. Replace the split pin and washer||Inspect within 100 hours time-in-service (TIS) after the effective date of this AD, and thereafter at intervals not to exceed 100 hours TIS. Accomplish the replacements prior to further flight after each inspection||In accordance with the PROCEDURES section of BN Service Bulletin BN2/SB.272, dated July 2000.|
|(2) If damage is found on the throttle friction-shaft, replace the shaft||Before further flight after each inspection where damage is found||In accordance with the PROCEDURES section of BN Service Bulletin BN2/SB.272, dated July 2000.|
(e) Can I comply with this AD in any other way? You may use an alternative method of compliance or adjust the compliance time if:
(1) Your alternative method of compliance provides an equivalent level of safety; and
(2) The Manager, Small Airplane Directorate, approves your alternative. Submit your request through an FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Small Airplane Directorate.
This AD applies to each airplane identified in paragraph (a) of this AD, 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 (e) 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 you have not eliminated the unsafe condition, specific actions you propose to address it.
(f) Where can I get information about any already-approved alternative methods of compliance? Contact Doug Rudolph, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4059; facsimile: (816) 329-4090.
(g) What if I need to fly the airplane to another location to comply with this AD? The FAA can issue a special flight permit under sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate your airplane to a location where you can accomplish the requirements of this AD.
(h) How do I get copies of the documents referenced in this AD? You may obtain copies of the documents referenced in this AD from Pilatus Britten-Norman Limited, Bembridge, Isle of Wight, United Kingdom PO35 5PR. You may examine these documents at FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106.
The subject of this AD is addressed in British AD 003-07-2000, dated August 22, 2000.Start Signature
Issued in Kansas City, Missouri, on October 26, 2001.
James E. Jackson,
Acting Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. 01-27653 Filed 11-6-01; 8:45 am]
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