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Aviation Alerts

This Special Airworthiness Information Bulletin (SAIB) informs the aviation industry of potential non-conforming Military Specifications (MS), Army Navy Standards (AN) and National Aerospace Standards (NAS) fasteners. The SAIB applies to manufacturers, owners, operators, and maintenance personnel of airplanes, rotorcraft, engines and appliances. This SAIB also asks the aviation industry to report fastener failures and other non-conformities. This bulletin focuses on MS 21042 nuts due to their wide usage in aviation, but is relevant to all other standard fasteners.
At this time, the airworthiness concern is not an unsafe condition and does not warrant an airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39. However, a significant number of past ADs noted possible unsafe conditions caused by non-conforming fasteners.

This Special Airworthiness Information Bulletin is to alert owners, operators, and maintenance technicians of Cessna Aircraft Company (Cessna) Model 177RG and Reims Model F177RG airplanes of an airworthiness concern, specifically the need to inspect the MLG actuator rod end bearing to ensure that cracks are not present.

This Special Airworthiness Information Bulletin is to alert owners, operators, and maintenance technicians of Cessna 300 and 400 Models and Series of an airworthiness concern, specifically the need to inspect the main landing gear (MLG) torque link assembly to ensure the correct thickness washers are installed and to ensure the washers are installed in the correct position.

This Special Airworthiness Information Bulletin (SAIB) informs owners, operators, and maintenance personnel of turbocharged, reciprocating engine-powered airplanes about the potential for in-flight fire as a result of failure of the exhaust system V-band coupling securing the tailpipe to the turbocharger, the wastegate overboard, or any other exhaust system V-band coupling.


The FAA has issued airworthiness directives (AD) in the past concerning V-band couplings for specific airplane models. These ADs remain in effect where applicable. For those airplanes not affected by a V-band coupling AD, this airworthiness concern is not considered an unsafe condition at this time that would warrant AD action under Title 14 of the Code of Federal Regulations, part 39.

We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft Company Model 500, 501, 550, 551, S550, 560, 560XL, and 650 airplanes. This AD was prompted by multiple reports of smoke and/or fire in the tailcone caused by sparking due to excessive wear of the brushes in the air conditioning (A/C) motor. This AD requires inspecting to determine if certain A/C compressor motors are installed and to determine the accumulated hours on certain A/C drive motor assemblies; repetitive replacement of the brushes in the drive motor assembly, or, as an option to the brush replacement, deactivation of the A/C system and placard installation; and return of replaced brushes to Cessna. We are issuing this AD to prevent the brushes in the A/C motor from wearing down beyond their limits, which could result in the rivet in the brush contacting the commutator causing sparks and consequent fire and/or smoke in the tailcone with no means to detect or extinguish the fire and/or smoke.

We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft
Company (Cessna) Model 525 airplanes equipped with certain part number (P/N) air conditioning
(A/C) compressor motors. This AD was prompted by reports of smoke and/or fire in the tailcone
caused by brushes wearing beyond their limits on the A/C motor. This AD requires inspection of the
number of hours on the A/C compressor hour meter, inspection of the logbook, replacement of the
brushes on certain P/N A/C compressor motors or deactivation of the A/C system until replacement
of the brushes, and reporting of airplane information related to the replacement of the brushes. We
are issuing this AD to correct the unsafe condition on these products.

We are revising an existing airworthiness directive (AD) for all Cessna Aircraft Company (Cessna) Models 190, 195 (L-126A,B,C), 195A, and 195B airplanes that are equipped with certain inboard aileron hinge brackets. That AD currently requires you to repetitively inspect the affected inboard aileron hinge brackets for cracks or corrosion and replace them if cracks or corrosion is found. Replacement with aluminum brackets would terminate the need for the repetitive inspections. This new AD retains the actions of AD 2004-21-08 while requiring future compliance following a revised service bulletin that clarifies the casting numbers and part numbers to be inspected. This AD was prompted by reports of confusion between the casting number on the aileron hinge bracket and the part number (P/N) called out in the AD. We are issuing this AD to correct the unsafe condition on these products.

This Special Airworthiness Information Bulletin (SAIB) is intended to remind owners and operators of any airplane with cable-driven flight controls of the importance of adhering to existing inspection procedures in the applicable maintenance or shop manuals.
At this time, this airworthiness concern is not considered an unsafe condition that would warrant airworthiness directive action under Title 14 of the Code of Federal Regulations (14 CFR), part 39.

This Special Airworthiness Information Bulletin (SAIB) advises owners and operators of various
airplanes equipped with W31 series switch style circuit breakers (SSCB) manufactured by Tyco
or Potter Brumfield of an airworthiness concern.

Specifically, there have been known continued failures of these SSCBs on Cessna Aircraft Company
airplanes and Beechcraft Corporation (formerly known as Hawker Beechcraft Corporation) airplanes.
These circuit breaker switches may also be installed on other type certificated airplanes as well as
homebuilt airplanes.

We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft Company Model 750 airplanes. This AD was prompted by reports of loss of displayed airspeed. This AD requires inspecting certain logic modules to determine if certain cabin altitude/pitot static heater module assemblies are installed and replacing those assemblies with a new assembly; and revising the Non-Normal Procedures Section of the airplane flight manual (AFM) to include procedures for resetting the pitot switch in the event of pitot heater failure and for total loss of airspeed indication. We are issuing this AD to prevent the loss of all displayed airspeed, which could result in reduced ability to control the airplane.

We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft
Company Models 172R and 172S airplanes. This AD was prompted by reports of chafing of a new
configuration of the fuel return line assembly, which was caused by the fuel return line assembly
rubbing against the right steering tube assembly during rudder pedal actuation. This AD requires you
to install the forward and aft fuel return line support clamps and brackets; inspect for a minimum
clearance between the fuel return line assembly and the steering tube assembly and clearance
between the fuel return line assembly and the airplane structure; and, if any damage is found, replace
the fuel return line assembly. We are issuing this AD to correct the unsafe condition on these
products.

This Special Airworthiness Information Bulletin (SAIB) is sent to advise manufacturers of
airplanes certified under parts 23 and 25 of the Federal Aviation Regulations (14 CFR parts 23
and 25) to consider the possibility that the airplane’s maximum lift coefficient in ground effect may
be lower than its maximum lift coefficient in free air.

This Special Airworthiness Information Bulletin (SAIB) alerts registered owners, operators, and
certified repair facilities of all airplanes equipped with Continental Motors, Inc. (CMI) series engines
(all models) of the service instructions to inspect the connecting rod piston pin bushing installation at
each cylinder removal or any time piston pin bushing material is identified during routine
maintenance procedures.

This Special Airworthiness Information Bulletin (SAIB) informs owners, operators, and maintenance
personnel of Cessna Aircraft Company Model T206H airplanes about the potential for in-flight
fire as a result of failure of the V-band coupling (V-band clamp) securing the tailpipe to the
turbocharger or the wastegate elbow to the wastegate valve.

We are adopting a new airworthiness directive (AD) for all Thielert Aircraft Engines
GmbH (TAE) TAE 125-02-99 and TAE 125-02-114 reciprocating engines. This AD requires
inspection of the oil filler plug vent hole at the next scheduled maintenance or within 110 flight hours
after the effective date of this AD. If chips are found to be blocking the vent hole, additional
corrective action is required before next flight.

We are adopting a new airworthiness directive (AD) for all Cessna Aircraft Company
(Cessna) Model 402C airplanes modified by Supplemental Type Certificate (STC) SA927NW and
Model 414A airplanes modified by STC SA892NW. This AD was prompted by report of a Cessna
Model 414A airplane modified by STC SA892NW that experienced an asymmetrical flap condition
causing an uncommanded roll when the pilot set the flaps to the approach position.

This Special Airworthiness Information Bulletin (SAIB) alerts owners, operators, and certified repair
facilities of an airworthiness concern regarding certain pushrod shroud spring retainers, manufactured
by Engine Components International (ECi). The pushrod shroud spring retainers, part number (P/N)
AEL14995, may be installed on Lycoming Engines O-320, IO-320, O-360, IO-360, O-540, and IO-
540 series reciprocating parallel valve engines.

This Special Airworthiness Information Bulletin is being issued to advise you of an airworthiness
concern on Cessna Model 425 airplanes. Specifically, it recommends pilots follow the emergency
procedures section of the Pilot’s Operating Handbook (POH) for “Nose Baggage Door Open on
Takeoff” if they experience an open nose baggage door (or avionics door, if equipped).

SUMMARY: We are superseding an existing airworthiness directive (AD) for all Thielert Aircraft
Engines GmbH models TAE 125-01, TAE 125-02-99, and TAE 125-02-114 reciprocating engines.
That AD currently requires installation of full-authority digital electronic control (FADEC) software
version 2.91. This new AD requires removing all software mapping versions prior to 292, 301, or
302, applicable to the TAE engine model.

SUMMARY: We are adopting a new airworthiness directive (AD) for Lycoming Engines TSIO-540-
AK1A, and Continental Motors, Inc. TSIO-360-MB, TSIO-360-SB, and TSIO-360-RB reciprocating
engines, with certain Hartzell Engine Technologies (HET) turbochargers, model TA0411, part
number (P/N) 466642-0001; 466642-0002; 466642-0006; 466642-9001; 466642-9002; or 466642-
9006, or with certain HET model TA0411 turbochargers overhauled or repaired since August 29,
2012.

SUMMARY: We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft
Company Models 172R and 172S airplanes. This AD was prompted by reports of chafed fuel return
line assemblies, which were caused by the fuel return line assembly rubbing against the right steering
tube assembly during full rudder pedal actuation. This AD requires you to inspect the fuel return line
assembly for chafing; replace the fuel return line assembly if chafing is found; inspect the clearance
between the fuel return line assembly and both the right steering tube assembly and the airplane
structure; and adjust as necessary. We are issuing this AD to correct the unsafe condition on these
products.

This Special Airworthiness Information Bulletin is to inform owners and operators of aircraft equipped with the KRA 405B Radar Altimeter of a potential undetected failure condition, wherein the Radar Altimeter may provide erroneous altitude information. At this time, this airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Aviation Regulations (14 CFR) part 39.

This Special Airworthiness Information Bulletin (SAIB) advises you, owners and operators, of all aircraft who may be using FreeFlight Systems (also known as Trimble) 2000 Approach (series) and 2101 Approach (series) Global Positioning System (GPS) navigation units of service difficulty reports. FreeFlight Systems (FFS) has determined that a potential exists for long computational delays in processing flight planning operations. FFS has issued Service Information Letter (SIL) SIL FFS08 describing the maintenance actions required to correct the in-service difficulties. At the time this SAIB is issued, the airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.

This Special Airworthiness Information Bulletin (SAIB) advises owners, aircraft operators, repair
facilities, Flight Standards District Offices (FSDOs), and Foreign Civil Aviation authorities of
recommended actions after a propeller strike or engine hydraulic lock incident on all Continental
Motors, Inc. (CM) (formerly Teledyne Continental Motors) direct drive and geared
reciprocating engines.
The airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD)
action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.

This Special Airworthiness Information Bulletin (SAIB) identifies new and revised guidance for industry related to Airworthiness Directive (AD) development and implementation processes. This SAIB provides recommendations for design approval holders (DAH) and owners/operators of transport category airplanes certificated under 14 CFR part 25. Implementation of the recommendations in this SAIB will improve the AD development and implementation processes which support continued operational safety of the existing airplane fleet.

This Special Airworthiness Information Bulletin (SAIB) alerts registered owners, operators, and
certified repair facilities of all airplanes equipped with Continental Motors, Inc. (CMI) series engines
(all models) of the service instructions to inspect the connecting rod piston pin bushing installation at
each cylinder removal or any time piston pin bushing material is identified during routine
maintenance procedures.
At this time, the airworthiness concern is not an unsafe condition that would warrant airworthiness
directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.

This Special Airworthiness Information Bulletin (SAIB) advises aircraft operators, Fixed Base
Operators (FBOs), FAA repair stations and FSDOs, and Foreign Civil Aviation Authorities, that jet
fuel made from hydroprocessed fatty acid esters and fatty acids (HEFA) or Fischer Tropsch (FT)
synthetic blending components that meets the requirements of ASTM International Standard D7566
is acceptable for use on aircraft and engines certificated for operation with D1655 Jet A or Jet A-1 jet
fuel, provided that it is re-identified as D1655 fuel. When re-identified as D1655 fuel, D7566 jet fuel
meets all the specification requirements of D1655 and therefore meets the approved operating
limitations for aircraft and engines certificated to operate with D1655 fuel, unless otherwise
prohibited by the engine or aircraft type certificate (TC) holder.

This Special Airworthiness Information Bulletin (SAIB) advises aircraft operators, Fixed Base
Operators (FBOs), FAA repair stations and Flight Standards District Offices, and Foreign Civil
Aviation Authorities that grade 100VLL aviation gasoline meeting the American Society for Testing
and Materials (ASTM) fuel specification D910 is acceptable for use on aircraft and engines
certificated for operation with D910 grades 80, 91, 100, and 100LL aviation gasolines. Grade
100VLL meets all the performance requirements of grades 80, 91, 100, and 100LL and therefore
meets the approved operating limitations for aircraft and engines certificated to operate with these
other grades of aviation gasoline.

This revised Special Airworthiness Information Bulletin (SAIB) alerts you, owners, operators, and certificated repair facilities, of any propeller, or any propeller component parts, repaired, inspected, or overhauled by Western Aircraft Propeller Service, Inc. (WAP) (Air Agency Certificate #FQ6R544N) of a revision to SAIB NE-09-48. At this time, the airworthiness concern is not an unsafe condition that would warrant airworthiness directive action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.

This Revised Special Airworthiness Information Bulletin (SAIB) alerts you, owners, operators, and certificated repair facilities of Lycoming four, six, and eight cylinder reciprocating engines with a Teledyne Continental Motors (TCM) (formerly Bendix) Series D2000 and D3000 Dual Magneto (2 magnetos with a single drive), of the possibility for the magneto to separate from the engine. Several conditions identified could result in separation of the magneto from the engine, which will result in the loss of power. These engines can be identified by the letter “D” in the 4th or 5th character in the engine model’s suffix. This revision updates the Lycoming Service Instruction (SI) No. from 1508B to SI 1508C. All other information remains the same.
Most of the problems have occurred in Lycoming IO-360-A1B6D and IO-360-A3B6D engines installed on Mooney M20J-201 and Cessna 177RG airplanes, although the potential for magneto separation exists on any engine with a TCM Dual Magneto installed. The airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.

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