AD 98-21-20

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 Raytheon Models 1900, 1900C, and 1900D airplanes was published in the Federal Register as a notice of proposed rulemaking (NPRM) on April 27, 1998 (63 FR 20543). The NPRM proposed to require either modifying the existing exterior placards with operating instructions installed in accordance with AD 97-04-02; or installing new exterior placards with operating instructions for the airstair door, cargo door, and emergency exits, as applicable. Accomplishment of the proposed action as specified in the NPRM would be in accordance with Raytheon Mandatory Service Bulletin No. 2741, Rev. 1, Issued: February, 1997; Revised: May, 1997.

The NPRM was the result of reports of the placards (required by AD 97-04-02) covering the atmospheric vents for the cabin door differential pressure lock.Interested persons have been afforded an opportunity to participate in the making of this amendment. Due consideration has been given to the comments received.

Comment Disposition One commenter recommends that an additional method of compliance be added to the proposal. The commenter states that the actions of AD 97-04-02 have already been accomplished on the commenter's fleet of aircraft. In addition to these actions, the modification of the placards that is proposed in this action was accomplished in accordance with the instructions in Beechcraft message No. 52-0506, dated February 21, 1997. These instructions basically incorporate the same information included in the modification instructions in Raytheon Mandatory Service Bulletin No. 2741, Rev.1, Issued: February, 1997; Revised: May, 1997.

The FAA concurs and will give alternative method of compliance credit in the AD for accomplishing the action in accordance with Beechcraft message No. 52-0506, dated February 21, 1997, in conjunction with Raytheon Mandatory Service Bulletin No. 2741, dated February, 1997.

Another commenter agrees with the intent of the AD, but feels that the FAA should have issued an urgent safety of flight AD through the use of a "final rule; request for comments."

After examining all the information related to the subject of this AD, the FAA did not feel it had sufficient justification for issuing an urgent safety of flight AD. No changes to the final rule are necessary.

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 the addition of the alternative method of compliance previously discussed and minor editorial corrections. The FAA has determined that this addition and the minor editorial 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 524 airplanes in the U.S. registry will be affected by this AD, that it will take approximately 1 workhour per airplane to accomplish this action, and that the average labor rate is approximately $60 an hour. Parts cost approximately $3 per airplane. Based on these figures, the total cost impact of this AD on U.S. operators is estimated to be $33,012, or $63 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 removing Airworthiness Directive (AD) 97-04-02, Amendment 39-9937, and by adding a new AD to read as follows: