Airworthiness Directives; Wytwornia Sprzetu Komunikacyjnego ``PZL-RZESZOW'' PZL-3S Second Series Engines

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 92-ANE-21; Amendment 39-8804; AD 94-02-06]

Airworthiness Directives; Wytwornia Sprzetu Komunikacyjnego

``PZL-RZESZOW'' PZL-3S Second Series Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment supersedes an existing airworthiness directive

(AD), applicable to Wytwornia Sprzetu Komunikacyjnego ``PZL-RZESZOW''

PZL-3S Second Series engines, that currently requires removal from

service of certain modified pistons, inspection of the propeller to

engine propeller-flange attachment bolts, inspection of the engine

propeller-flange retaining nut, and inspection of the rear crankshaft

counterweight system. This amendment removes the repetitive inspection

requirements of the existing AD, but retains the requirement to remove

from service certain modified pistons. This amendment is prompted by

test results that have indicated that PZL-3S Second Series engines not

configured with modified pistons are not susceptible to excessive

vibration. The actions specified by this AD are intended to prevent

separation of the propeller and loss of the aircraft.

EFFECTIVE DATE: February 28, 1994.

FOR FURTHER INFORMATION CONTACT: Robert J. Ganley, Aerospace Engineer,

Engine Certification Office, FAA, Engine and Propeller Directorate, 12

New England Executive Park, Burlington, MA 01803-5299; telephone (617)

238-7138, fax (617) 238-7199.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal

Aviation Regulations by superseding AD 91-18-12, Amendment 39-8120 (57

FR 5378, February 14, 1992), which is applicable to Wytwornia Sprzetu

Komunikacyjnego ``PZL-RZESZOW'' PZL-3S Second Series engines, was

published in the Federal Register on January 5, 1993 (58 FR 278). That

action proposed to remove the repetitive inspection requirements of the

existing AD, but retain the requirements for removal from service of

certain pistons that have been modified and assembled with certain

compression ring, scraper ring, and oil control ring components.

Interested persons have been afforded an opportunity to participate

in the making of this amendment. No comments were received on the

proposal or the FAA's determination of the cost to the public. The FAA

has determined that air safety and the public interest require the

adoption of the rule as proposed.

There are approximately 11 PZL-3S Second Series engines of the

affected design in the worldwide fleet. The FAA estimates that 3

engines of the affected design are installed on aircraft of U.S.

registry, that it will take approximately 5 work hours per engine to

accomplish the proposed actions, and that the average labor rate is $55

per work hour. Based on these figures, the total cost impact of the AD

on U.S. operators is estimated to be $825.

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 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.''

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 14 CFR part

39 of the Federal Aviation Regulations as follows:

PART 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. App. 1354(a), 1421 and 1423; 49 U.S.C.

106(g); and 14 CFR 11.89.

Sec. 39.13 [Amended]

2. Section 39.13 is amended by removing Amendment 39-8120 (57 FR

5378, February 14, 1992) and by adding a new airworthiness directive,

Amendment 39-8804, to read as follows:

94-02-06 Wytwornia Sprzetu Komunikacyjnego ``PZL-RZESZOW'':

Amendment 39-8804. Docket 92-ANE-21. Supersedes AD 91-18-12,

Amendment 39-8120.

Applicability: Wytwornia Sprzetu Komunikacyjnego ``PZL-RZESZOW''

PZL-3S Second Series reciprocating engines installed on but not

limited to Grumman AG CAT aircraft.

Compliance: Required as indicated, unless accomplished

previously.

To prevent separation of the propeller and loss of the aircraft,

accomplish the following:

(a) For pistons that have been modified and assembled with

compression ring, part number (P/N) JRS 123421, scraper ring, P/N

JRS 123423, and oil control ring, P/N JRS 123424, prior to further

flight:

(1) Remove these pistons from service and replace with

serviceable parts.

(2) Remove, clean, and visually inspect using 10x magnification

the propeller to engine propeller-flange attachment bolts for

evidence of cracking or failure, and perform the following:

(i) For engines with bolts found to be cracked or broken,

replace with new bolts and disassemble and visually inspect for

distress of the rear crankshaft, rear counterweight, and rear

counterweight pins.

(A) If any distress is found in the rear crankshaft, rear

counterweight, or rear counterweight pins, replace distressed parts

with new parts.

(B) Distress is defined as any evidence of wear, galling,

pitting, or scoring, and includes discoloration (blue color) of the

counterweight pins.

(ii) For engines with bolts found not to be cracked, inspect the

engine propeller-flange retaining nut for looseness and perform the

following:

(A) Retorque the propeller-flange retaining nut if found loose

in accordance with Section 3.3.4 of the PZL-3S Engine Servicing

Instructions, revised March 1984.

(B) Replace all propeller to engine propeller-flange attachment

bolts with new bolts.

(b) An alternative method of compliance or adjustment of the

compliance time that provides an acceptable level of safety may be

used if approved by the Manager, Engine Certification Office. The

request should be forwarded through an appropriate FAA Maintenance

Inspector, who may add comments and then send it to the Manager,

Engine Certification Office.

Note: Information concerning the existence of approved

alternative method of compliance with this AD, if any, may be

obtained from the Engine Certification Office.

(c) Special flight permits may be issued in accordance with FAR

21.197 and 21.199 to operate the aircraft to a location where the

requirements of this AD can be accomplished.

(d) This amendment becomes effective on February 28, 1994.

Issued in Burlington, Massachusetts, on January 12, 1994.

Jay J. Pardee,

Acting Manager, Engine and Propeller Directorate, Aircraft

Certification Service.

[FR Doc. 94-1687 Filed 1-26-94; 8:45 am]

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