FAA AD 2010-04-05 McCauley Propeller Systems 1A103/TCM Series Propellers
- AD requires, for certain serial numbers (S/Ns)of McCauley Propeller Systems A103 /TCM series propellers, initial and repetitive visual and dyepenetrant inspections for cracks in the propeller hub, replacement of propellers with cracks that do not meet acceptable limits, and rework of propellers with cracks that meet acceptable limits
- AD requires, for all McCauley Propeller Systems 1A103/TCM series propellers, the same actions but at reduced compliance times.
- This AD also requires inspections of the bolt holes, reaming holes if necessary, and inspections of steel reinforcement plates and gaskets
5 AD issued to prevent propeller separation due to hub fatigue cracking, which can result in loss of control of the aeroplane
6 AD 2003-12-05 required inspections starting at 3,000 operating hours TIS
7. McCauley ASB221E, dated January 28, 2010 describes, for all McCauley 1A103 /TCM series propellers, procedures for initial and repetitive visual and dyepenetrant inspections for cracks in the propeller hub, removal from service of propellers with cracks that do not meet acceptable limits, and rework of propellers with cracks that meet acceptable limits
Applicability = McCauley 1A103/TCM series propellers, all serial numbers.
Initial Inspection of Propellers Not Previously Inspected
(f) For propellers not previously inspected using McCauley SB No. 221C,dated September 7, 1999, or ASB221D, dated January 28, 2008, do the following:
(1) For propellers with more than 1,500 operating hours time-since-new (TSN) or unknown operating hours TSN on the effective date of this AD, within the next 50 op TIS
(2) For propellers with 1,500 or fewer operating hours TSN on the effective date of this AD, upon reaching 1,500 operating hours TSN or within the next 50 operatinTIS
Initial Inspection of Propellers Previously Inspected
(g) For propellers previously inspected using McCauley SB No. 221C, dated September 7,1999, or McCauleyASB221D, dated January 28, 2008, do the following:
(1) For propellers with more than 1,500 operating hours TSN on the effective date of this AD, and with 750 or more operating hours time-since-last-inspection (TSLI), within the next 50 operating hours TIS, do the actions specified in paragraphs (h) through (m) of this AD.
(2) For propellers with more than 1,500 operating hours TSN on the effective date of this AD, and with fewer than 750 operating hours TSLI, before reaching 750 operating hours TSLI or within the next 50 operating hours TIS, whichever occurs later, do the actions specified in paragraphs (h)through (m) of this AD.
(h) Visual- and dye-penetrate-inspect for cracks in the propeller hub.
(i) Inspect the bolt holes and ream the holes if necessary.
(j) Inspect the steel reinforcement plates and gaskets.
(k) Remove propellers that are not within the bolt hole inspection limits or have cracks that are not within the rework limits.
(l) Rework propellers that have cracks that meet acceptable rework limits.
(m) Use the Accomplishment Instructions of McCauley ASB No. ASB221E, dated January 28,2010, to do the inspections, rework, and removals from service. Repetitive Propeller Inspections
(n) Thereafter, for all propellers, within every additional 750 operating hours TIS perform the actions in paragraphs (h) through (m) of this AD.
ASB221E January 28, 2010
INSPECTION OF MODEL 1A103/TCM PROPELLER HUB FOR CRACKING AND REWORK PROCEDURES
MODELS AFFECTED 1A103/TCM (All Serial Numbers)
REASON–McCauley has received reports of cracks in the 1A103/TCM model propeller hub. Cracks have been found on the camber side of the propeller hub near the mounting bolt holes. These crack(s) have been observed primarily in areas where fretting is present around propeller mounting bolt holes.
All inspection and replacement requirements must be done at the compliance times and intervals shown below.
1. For propellers with 1500 hours or more total time in service or if the propeller total time in service unknown:
a) Inspection and rework procedures must be done within the next 50 hours of service.
NOTE: For propellers that have previously been inspected in accordance with SB 221C or ASB221D, compliance with the initial inspection requirements of ASB221E is not required.
2. For propellers with less than 1500 hours total time in service:
a) Inspection and rework procedures must be done at 1500 hours total time in service or within the next 50 hours of service, whichever occurs later.
3. Repetitive Inspections:
a) After completing the initial inspection of the propeller, steel reinforcement plate, and mylar gasket, repetitive inspections must be accomplished every 36 calendar months or every 750 hours of service, whichever occurs first.
SERVICE BULLETIN SB137AE February 17, 2010
REVISED TIME BETWEEN OVERHAUL (TBO) and LIFE LIMITED PARTS SPECIFICATIONS
Fixed Pitch Propellers P.
D. 2000 hours or 72 calendar months, whichever occurs first, except:
P. Fixed pitch propellers – 2000 hours or 72 calendar months which ever occurs first*.
Additionally,1. The propeller mounting bolt torque should be checked at least once per year. 2. Propeller mounting bolts must be magnetic particle inspected in accordance with ASTM E-1444 or liquid penetrant inspected in accordance with ASTM E-1417 or replaced at every overhaul. 3.Propeller mounting bolts must be replaced whenever the propeller is involved in a blade strike as defined in Service Bulletin 176[X].
(2) *For 1A103/TCM [XXXX] propellers only, the overhaul frequency is every 1500 hours of operation or 72 calendar months, whichever occurs first. All propellers with 1500 or more hours total time in service must be inspected in accordance with Alert Service Bulletin 221[X] every 750 hours of operation or 36 calendar months whichever occurs first