AD 2005-04-08 Airworthiness Directives; Hartzell Propeller Inc. Model HC-B3TN-5( )/T10282( ) Propellers

Makes named: hartzell. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Hartzell Propeller Inc. model HC-B3TN-5( )/T10282( ) propellers installed on the airplane and engine combinations shown in the following Table 1 (excluding propellers with blades part number (P/N) T10282N( ), T10282NB( ), T10282NK( ), or T10282NE( ) installed). Table 1.—Applicability Airplane model Propeller model Engine model Fairchild SA226-TC Fairchild SA226-AT HC-B3TN-5( )/T10282( ) Garrett TPE331-10UA-511G Fairchild SA226-T (d) For reference, airplanes incorporating Supplemental Type Certificates (STCs) SA344GL-D, SA4872SW, and SA345GL-D have these engine, propeller, and airplane combinations. (e) The parentheses appearing in the propeller model number indicates the presence or absence of an additional letter(s) that varies the basic propeller model. This AD still applies regardless of whether these letters are present or absent in the propeller model designation.

You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.

Within 10 hours time-in-service (TIS) after the effective date of this AD, perform a document search to determine if the following actions have been done: (1) The propeller blades meet the initial and repetitive compliance requirements of Priority Letter AD 88-24-15. (2) The P/N T10282( ) propeller blades have been replaced with P/N T10282N( ), T10282NB( ), T10282NK( ), or T10282NE( ) propeller blades. (i) If the actions in paragraph (h)(1) or (h)(2) of this AD have not been done, then do one of the following: (1) Inspect the blades using Paragraph 3 of the Accomplishment Instructions of Hartzell Service Bulletin (SB) No. 136, Revision Letter “I,” dated April 25, 2003, within 500 hours time-since-new (TSN) or time-since-last-overhaul (TSLO) and not to exceed two years after the effective date of this AD, whichever occurs first; and thereafter within 500 service-hour intervals; or (2) Replace with P/N T10282N( ), T10282NB( ), T10282NK( ), or T10282NE( ) propeller blades as applicable, within 500 hours TSN or TSLO and not to exceed two years after the effective date of this AD, whichever occurs first. (j) If the actions in paragraph (h)(1) of this AD have been done, but not the actions in paragraph (h)(2) of this AD, then do the following: (1) Inspect the blades within 500 hours since the last Hartzell SB No. 136E, or later Revision, inspection, and thereafter within 500 service hour intervals, using Paragraph 3 of the Accomplishment Instructions of Hartzell SB No. 136, Revision Letter “I,” dated April 25, 2003. (2) Replace before further flight all blades showing evidence of cracks or other unairworthy conditions, as noted in Hartzell SB No. 136, Revision Letter “I,” dated April 25, 2003, with airworthy blades. Hartzell SB No. 136 (k) Since Hartzell SB No. 136E was issued, the SB has been revised to 136F, 136G, 136H, and 136I. Any of these revisions are suitable for determining past compliance, as they are all approved as alternative methods of compliance (AMOC). After the effective date of this AD, compliance is restricted to SB No. 136, Revision Letter “I,” or later versions when approved by an AMOC. Optional Terminating Action (l) Installation of propeller blades, P/N T10282N( ), T10282NB( ), T10282NK( ), or T10282NE( ) as applicable, onto a Hartzell Propeller Inc. model HC-B3TN-5( ) propeller constitutes terminating action to the inspections, repairs, and replacements specified in paragraphs (i) through (j)(2) of this AD. Alternative Methods of

This AD results from a review of all currently effective ADs. That review determined that Priority Letter AD 88-24-15 was not published in the Federal Register to make it effective to all operators, as opposed to just the operators who received actual notice of the original Priority Letter AD. This AD also results from the discovery that the original AD omitted an airplane model with a certain STC from the applicability. We are issuing this AD to prevent possible blade failure near the hub which can result in blade separation, engine separation, damage to the airplane, and possible loss of the airplane.