Source: https://www.federalregister.gov/documents/2006/10/26/E6-17935/airworthiness-directives-teledyne-continental-motors-gtsio-520-series-reciprocating-engines
Timestamp: 2017-08-17 00:36:04
Document Index: 21671196

Matched Legal Cases: ['art 91', 'art 1', 'art 2', '§\u200939', 'art 4', 'art 1', 'art 3', 'art 2', 'art 2', 'art 3', 'art 3', 'art 3', 'art 3', 'art 5']

62570-62572 (3 pages)
Actions Since AD 2005-20-04 Was Issued
Installation of TCM Service Kit, EQ6642 or EQ6642R
https://www.federalregister.gov/d/E6-17935 https://www.federalregister.gov/d/E6-17935
The FAA proposes to supersede an existing airworthiness directive (AD) for Teledyne Continental Motors (TCM) GTSIO-520 series reciprocating engines. That AD currently requires initial and repetitive visual inspections of the starter adapter assembly and crankshaft gear and unscheduled visual inspections of the starter adapter assembly and crankshaft gear due to a rough-running engine. That AD also requires replacement of the starter adapter shaft gear needle bearing with a certain bushing and installation of a certain TCM service kit at the next engine overhaul, or at the next starter adapter replacement, whichever occurs first. This proposed AD would require the inspection ordered in paragraph (h) of AD 2005-20-04 to be done every 100 hours time-in-service (TIS), or annually. This proposed AD results from an error discovered in AD 2005-20-04. We are proposing this AD to prevent failure of the starter adapter assembly and or crankshaft gear, resulting in failure of the engine and possible forced landing.
We invite you to send any written relevant data, views, or arguments regarding this proposal. Send your comments to an address listed under ADDRESSES. Include “Docket No. FAA-2005-20850; Directorate Identifier 2005-NE-05-AD” in the subject line of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments.
On September 20, 2005, the FAA issued AD 2005-20-04, Amendment 39-14297 (70 FR 56355, September 27, 2005). That AD requires initial and repetitive visual inspections of the starter adapter assembly and crankshaft gear and unscheduled visual inspections of the starter adapter assembly and crankshaft gear due to a rough-running engine. That AD also requires replacement of the starter adapter shaft gear needle bearing with a certain bushing and installation of a certain TCM service kit at the next engine overhaul, or at the next starter Start Printed Page 62571adapter replacement, whichever occurs first. That AD resulted from six service difficulty reports and one fatal accident report that related to failed starter adapter assemblies.
Since we issued that AD, we discovered an error in paragraph (h). In that paragraph, we specify an inspection at the next 100-hour or annual inspection, whichever occurs first. However, because most of the airplanes are privately owned and operate under 14 CFR part 91, they are not required to perform 100-hour inspections. This proposed AD would correct that error and require the inspections every 100 hours TIS, instead of at the next 100-hour inspection.
Also, since we issued AD 2005-20-04, TCM revised the mandatory service bulletin required by this AD. It is now identified as Mandatory Service Bulletin (MSB) No. MSB94-4G, dated October 31, 2005, and includes a service kit with new, rather than rebuilt parts.
We have reviewed and approved the technical contents of Teledyne Continental Aircraft Engine, MSB94-4G, dated October 31, 2005 that provides inspection and replacement procedures for the starter adapter assembly and crankshaft gear. That MSB also describes procedures for replacement of the needle bearing, part number (P/N) 537721, with P/N 654472. That MSB also describes procedures for installation of TCM service kits EQ6642 (new) or EQ6642R (rebuilt).
Although TCM MSB No. MSB94-4G, dated October 31, 2005, applies to GIO-550 and GTSIO-520 series reciprocating engines, this proposed AD would only apply to GTSIO-520 series reciprocating engines. Also, although that MSB mandates in Part 1, that magnetos must be overhauled and periodically inspected at specified times, this proposed AD would not mandate those actions.
Inspection and replacement of components specified in Part 2 of the MSB as necessary every 100 hours TIS or annually, whichever occurs first.
Inspection of starter adapters with more or less than 400 hours TIS or unknown TIS.
Installation of TCM service kit, P/N EQ6642 or P/N EQ6642R, at next engine overhaul, or at next starter adapter replacement, whichever occurs first.
We estimate that this AD will affect 4,240 engines installed on airplanes of U.S. registry. We also estimate that it would take about one work-hour per engine to perform the inspection, about one work-hour per engine to perform the proposed bushing installation and about six work-hours per engine to install the TCM service kit. The average labor rate is $80 per work-hour. We estimate that about 25 percent of the engines will require an unscheduled (rough-running engine) inspection and about half of the engines will require the bushing and TCM service kit. Required bushings would cost about $16 per engine and service kits about $800 per engine. Based on these figures, we estimate the total cost of the proposed AD to U.S. operators to be $6,393,432.
2. The FAA amends § 39.13 by removing Amendment 39-14297 (70 FR 56355, September 27, 2005) and by adding a new airworthiness directive, Amendment 39-XXXXX, to read as follows:
(b) This AD supersedes AD 2005-20-04, Amendment 39-14297. Start Printed Page 62572
(c) This AD applies to Teledyne Continental Motors (TCM) GTSIO-520 series reciprocating engines. These engines are installed on, but not limited to, Twin Commander (formerly Aero Commander) model 685, Cessna model 404, 411 series, and 421 series, British Aerospace, Aircraft Group, Scottish Division model B.206 series 2 and Aeronautica Macchi model AM-3 airplanes.
(d) This AD results from an error discovered in AD 2005-20-04. We are issuing this AD to prevent failure of the starter adapter assembly and or crankshaft gear, resulting in failure of the engine and possible forced landing.
(f) If, during an inspection required by paragraph (g), (h), (i), or (j) of this AD, you find needle bearing, part number (P/N) 537721, installed in the crankcase, replace it with a serviceable bushing, before reassembling components. Use the bushing installation procedure specified in Part 4 of TCM Mandatory Service Bulletin (MSB) No. MSB94-4G, dated October 31, 2005.
(1) Before further flight, perform the inspection procedures specified in Part 1 and Part 3 of TCM MSB No. MSB94-4G, dated October 31, 2005, and replace components as necessary.
(2) An engine is considered rough-running if there is a sudden increase in the perceived vibration levels that cannot be cleared by adjustment of the engine controls; particularly the fuel mixture setting. Information on rough running engines can be found in the aircraft manufacturer's Airplane Flight Manual, Pilot's Operating Handbook, or Aircraft Owners Manual.
(h) For any engine that has been inspected using paragraph (h) of AD 2005-20-04 and the 100-hour inspection procedures or 100 hour TIS intervals or annual inspection procedures, continue the inspections as follows:
(1) Perform the inspection procedures specified in Part 2 of TCM MSB No. MSB94-4G, dated October 31, 2005 and replace components as necessary at each 100 hour TIS interval (plus or minus 10 hours TIS) or annual inspection, whichever occurs first.
(2) Thereafter, at each 100 hour TIS interval (plus or minus 10 hours TIS) perform repetitive inspections and component replacements as specified in paragraph (h)(1) of this AD.
(i) For any engine that has not been inspected using paragraph (h) of AD 2005-20-04, within 25 hours TIS or at the annual inspection, whichever occurs first, do the following:
(1) Perform the inspection procedures specified in Part 2 of TCM MSB No. MSB94-4G, dated October 31, 2005 and replace components as necessary.
(2) Thereafter, at each 100-hour TIS interval (plus or minus 10 hours TIS) perform repetitive inspections and component replacements as specified in paragraph (i)(1) of this AD.
(3) If the inspection is performed at more than 100 hour intervals, subtract the additional hours from the next scheduled 100 hour inspection.
(1) Within 25 hours TIS, perform the inspection procedures specified in Part 3 of TCM MSB No. MSB94-4G, dated October 31, 2005, and replace components as necessary.
(2) Thereafter, at 400-hour TIS intervals, (plus or minus 10 hours TIS), perform repetitive inspections and component replacements specified in Part 3 of TCM MSB No. MSB94-4G, dated October 31, 2005, and replace components as necessary.
(1) Upon accumulation of 400 hours TIS, (plus or minus 10 hours TIS), perform the inspection procedures specified in Part 3 of TCM MSB No. MSB94-4G, dated October 31, 2005, and replace components as necessary.
(2) Thereafter, at 400-hour TIS intervals, (plus or minus 10 hours TIS), perform repetitive inspections and component replacements, as specified in Part 3 of TCM MSB No. MSB94-4G, dated October 31, 2005, and replace components as necessary.
(1) Install TCM service kit, P/N EQ6642 (new) or EQ6642R (rebuilt). Use the service kit installation procedures specified in Part 5 of TCM MSB No. MSB94-4G, dated October 31, 2005.
(2) Continue performing the inspections and component replacements specified in paragraphs (g), (h), (i), (j) and (k) of this AD.
(m) Special flight permits are prohibited for rough-running engines described in paragraph (g)(2) of this AD.
(n) The Manager, Atlanta Aircraft Certification Office, FAA, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19.
[FR Doc. E6-17935 Filed 10-25-06; 8:45 am]