172Skyhawk

Seat slippage or departure of the seat roller housing from the seat rail may prevent pilots from reaching flight controls. This AD requires repetitive inspections of seat rails, pins, rollers, and related components, with replacement of parts as necessary.

Cessna Model 172 aircraft modified with STC SA01303WI may experience in-flight engine shutdown due to electrical power loss to the FADEC system. This AD requires installation of a FADEC backup battery, replacement of pilot operating handbook and flight manual, and replacement of the backup battery every 12 calendar months.

Certain Cessna aircraft may have an alternate static air source selector valve port obstructed by an improperly installed part number identification placard, causing erroneous altimeter, airspeed, and vertical speed indications. This AD requires inspection of the placard and port, removal of the placard if it obstructs the port, and reporting to the FAA if obstruction is found.

The part number identification placard on the alternate static air source selector valve may obstruct the port, causing erroneous altimeter, airspeed, and vertical speed indications. This AD requires inspection of the valve and removal of any obstructing placard.

The seat base/back attach brackets on certain Cessna 172, 182, and 206 series airplanes can fail at the weld, risking seat collapse during flight. This AD requires removal and modification of the crew seat base/back attach brackets, then reinstallation of the seats.

The pick-up collar assembly on the BRS parachute systems may prematurely separate from the launch tube, affecting rocket trajectory and preventing successful parachute deployment. This AD requires replacement of the pick-up collar support and nylon screws on affected systems.

Loose fuel line fittings on flexible hoses in the engine compartment can cause partial or complete loss of engine power and uncontrolled fire. This AD requires physically establishing and verifying the correct torque values on fuel hose end fittings, not visual inspection alone.

Crew seat back cylinder lock assemblies may fail, crack, or bend, allowing uncontrolled seat movement or backward collapse during flight. Install Modification Kit MK172-25-10C or a steel lock rod/bar on both crew seat back cylinder lock assemblies, or inspect and correct any discrepancies if earlier modification kits were installed.

Some MC01-3A main electrical power junction boxes have incorrect circuit breakers installed that may trip prematurely, potentially causing loss of all electrical power and navigation/communication equipment. You must inspect the main electrical power junction box and replace any incorrect circuit breakers with the correct 40-amp breaker.

Flight control system rigging problems on these Cessna models could cause loss of airplane control. The AD requires a one-time detailed inspection of the flight control system, correction of any installations that do not conform to type design, and repair of any damage found.

This is a correction to AD 2004-19-01 that fixes an incorrect serial number reference for Model T337B airplanes (337-0570 instead of 37-0570). The original AD addresses a previously identified safety issue requiring inspection or modification.

Slippage of pilot and co-pilot upper shoulder harness adjusters can prevent proper belt length adjustment and tension, risking pilot injury. Inspect and modify affected shoulder harness adjusters per revised service information.

This AD addresses certain Cessna aircraft equipped with Honeywell KAP 140 autopilot systems that may have outdated software. Operators must install a software update, change the unit's part number, and update the software modification identification tab.

TKS anti-ice boots on certain Hartzell propellers installed using a specific SOCATA procedure can corrode and fail, risking propeller blade separation. The AD requires removing the anti-ice boots, inspecting and reworking the blade area, and installing new anti-ice boots.

Certain diaphragm type AC4886 fuel pumps have experienced valve and diaphragm failures, which could cause reduction or loss of engine power or external fuel leaks. This AD requires removing the affected fuel pump before further flight and prohibits its installation.

External electrical noise can cause inaccurate course deviation displays on GNS 430 units, potentially leading pilots to make unsafe flight decisions. This AD requires modification of affected GNS 430 units to incorporate circuitry changes that prevent external noise from degrading course deviation and flag outputs.

Electrical shorts between the map light switch and fuel line in the left forward door post can cause fuel leaks and in-flight fires. Inspect for chafing, repair any damage, provide clearance between components, and install a switch cover insulator; repeat inspections and replacement as needed.

Certain Cessna 172R and 172S airplanes may have improper engine idle speed and fuel control mixture settings. The AD requires a one-time inspection of these settings, adjustment if necessary, and incorporation of corrected engine operating procedures into the pilot's operating handbook.

Fuel strainer assemblies on these airplanes were found to have fuel standpipes incorrectly installed, which could allow foreign material to enter the fuel system and engine. The AD requires measuring the standpipe length and replacing any fuel strainer assembly that does not meet the correct specification.

Fuel selector valve cams and valves manufactured with defective control shafts may prevent both fuel tanks from supplying fuel to the engine, potentially causing inadequate fuel supply and emergency landing or loss of control. This AD requires replacement of affected fuel selector valve cams and valves and prohibits future installation of these defective parts.

Certain Cessna 172R airplanes equipped with a friction-reducing elevator control modification may have incorrect length control yoke pivot bolts that can rub against and damage aileron control cables. The AD requires inspection of the control yoke pivot bolt for clearance, and replacement of the bolt and any damaged aileron cables if inadequate clearance is found.

BFGoodrich SKYWATCH SKY497 installations with top-mounted antennas can experience internal component failure that changes the antenna configuration, causing target indicators to display on the wrong side of the aircraft. This AD requires verifying correct antenna configuration at power-up and removing from service any installations with incorrect antenna configuration.

An aileron control cable in the right wing may be incorrectly routed, frayed, or damaged, potentially causing loss of aileron control. Inspect the right wing aileron control cable and correct any routing issues or replace damaged cables.

Overheated components in electric door seal inflation systems can cause smoke and cockpit fires on aircraft equipped with Bob Fields Aerocessories inflatable door seals. The AD requires either deactivating the system and installing a placard with AFM documentation, or removing the inflatable door seals and installing original equipment manufacturer seals or FAA-approved alternatives.

Certain Cessna 172R airplanes are missing rivets in the lower forward doorpost bulkhead that were omitted during manufacture. This AD requires installing those rivets to restore structural rigidity and prevent cracking or loss of control.

AlliedSignal KT 76A ATC transponders with certain serial numbers are transmitting misleading altitude information to ATC radar and TCAS-equipped aircraft. This AD requires replacing two resistor network modules with glass-coated modules on affected transponders.

Certain Cessna 172R airplanes may have incorrectly routed aileron control cables, loose mounting hardware, and improperly tensioned flight control cables that could result in loss of control. This AD requires inspecting these systems and correcting any deficiencies found.

Inadequate or failed welds in the Aeroquip engine exhaust muffler are leaking exhaust gas and carbon monoxide into the cabin heating system and cabin. This AD requires de-activating the cabin heating system and installing a placard until the muffler is replaced.

Improper installation of identification placards on alternate static air sources can cause erroneous instrument indications, potentially leading to loss of control. This AD requires installing placards, inspecting the alternate static air source valve, and reworking or replacing components as necessary.

Cowling can rub against the gascolator drain valve or tailpipe, causing fuel loss and engine stoppage. This AD requires checking clearance between the gascolator and cowling and between the tailpipe and cowling, and modifying these areas if rubbing is found or within a specified time period if not.

Certain Cessna fuel, oil, and hydraulic hoses with part number S51-10 installed between March 1995 and February 3, 1997 may have defective reinforcement wrapping that can cause hose collapse and system failure. This AD requires checking maintenance records for these hoses, inspecting them for diagonal or spiral external reinforcement, and immediately replacing any nonconforming hoses with ones having criss-cross reinforcement.

Two propeller blade separations have occurred on Hartzell HC-92WK and HC-92ZK propellers at less than 1,000 hours since last inspection, creating a risk of aircraft loss of control. The AD requires one-time inspection of blade clamp screws followed by repetitive dye penetrant inspections, compressive rolling, and screw replacement at 500-hour intervals.

Unapproved connecting rod bolts sourced from Superior Air Parts, Inc., have failed in certain Textron Lycoming engines, potentially causing engine failure. The AD requires removing all suspect connecting rod bolts prior to further flight and replacing them with serviceable bolts.