The Federal Register

Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135BJ and EMB-145XR Airplanes

Wed, Jun 11 2008 11:00:00 GMT

We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

It has been found that in case of fuel leakage inside the conduit used to route the clear ice detector wiring through the wing fuel tank, it is possible to have fuel accumulation inside the conduit due to application of wiring protection sealant in the conduit end. The absence of fuel leakage detectability into the clear ice detector wiring conduit, associated with an ignition source, could result in fire or explosion inside the tank.
We are issuing this AD to require actions to correct the unsafe condition on these products.

Airworthiness Directives; Boeing Model 737-600, -700, -700C, - 800, and -900 Series Airplanes

Wed, Jun 11 2008 11:00:00 GMT

We are adopting a new airworthiness directive (AD) for certain Boeing Model 737600, 700, 700C, 800, and 900 series airplanes. This AD requires various repetitive inspections to detect cracks along the chemically milled steps of the fuselage skin or missing or loose fasteners in the area of the preventative modification or repairs, replacement of the timelimited repair with the permanent repair if applicable, and applicable corrective actions if necessary, which would end certain repetitive inspections. This AD results from a fatigue test that revealed numerous cracks in the upper skin panel at the chemically milled step above the lap joint. We are issuing this AD to detect and correct such fatiguerelated cracks, which could result in the crack tips continuing to turn and grow to the point where the skin bay flaps open, causing decompression of the airplane.

Airworthiness Directives; Boeing Model 777 Airplanes

Wed, Jun 11 2008 11:00:00 GMT

We are adopting a new airworthiness directive (AD) for certain Boeing Model 777 airplanes. This AD requires an inspection to determine the manufacturer and manufacture date of the oxygen masks in the center and outboard passenger service units, crew rests, and lavatory and flight attendant oxygen boxes, as applicable. This AD also requires related investigative/corrective actions if necessary. This AD results from a report that several passenger masks with broken inline flow indicators were found following a mask deployment. We are issuing this AD to prevent the inline flow indicators of the passenger oxygen masks from fracturing and separating, which could inhibit oxygen flow to the masks and consequently result in exposure of the passengers and cabin attendants to hypoxia following a depressurization event.

Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

Wed, Jun 11 2008 11:00:00 GMT

This assessment showed that the electrical harness of the Fuel Quantity Gauging System (FQGS) is installed in the same routing as the 28 Volts AC, 28 Volts DC, and 115 Volts AC electrical harnesses. A chafing condition between these electrical harnesses and the FQGS harness could increase the surface temperatures of fuel quantity probes and high level sensors inside the fuel tank, resulting in potential ignition source[s] and consequent fuel tank explosion. * * * * *
We are issuing this AD to require actions to correct the unsafe condition on these products.

Airworthiness Directives; Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) and CL-600-2D24

Wed, Jun 11 2008 11:00:00 GMT

The assessment and lightning tests showed that certain fuel tube selfbonded couplings do not provide sufficient lightning current capability. The assessment also showed that single failure of the integral bonding wire of the selfbonded couplings could affect electrical bonding between the tubes.

Insufficient electrical bonding between fuel tubes or insufficient current capability of fuel tube couplings, if not corrected, could result in arcing and potential ignition source[s] inside the fuel tank during lightning strikes and consequent fuel tank explosion. * * *
We are issuing this AD to require actions to correct the unsafe condition on these products.

Airworthiness Directives; British Aerospace Regional Aircraft Model HP.137 Jetstream Mk.1, Jetstream Series 200 and

Wed, Jun 11 2008 11:00:00 GMT

We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation
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product. The MCAI describes the unsafe condition as:

A failure mode has been identified following the examination of parts from another aircraft type (Jetstream 4100 series) that can lead to the loss of a nosewheel. The Jetstream (HP.137) Mk1, 200, 3100 and 3200 series use a similar method for retaining the wheel assemblies on the landing gear axle and can therefore experience the same type of failure, i.e. a combination of excessive wear and/or adverse tolerances on the axle inner cone, outer cone or wheel hub splined sleeve cones resulting in the loss of the critical gap between the inner flange face of the wheel outer cone and the axle end face. If this gap is lost, it results in the wheel having free play alon

Airworthiness Directives; Cessna Aircraft Company Model 525 Airplanes

Wed, Jun 11 2008 11:00:00 GMT

We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft Company (Cessna) Model 525 airplanes. This AD requires you to inspect for missing firewall sealant between the aft firewall assembly and seal assembly; and, if you find that firewall sealant is missing, seal with firewall sealant between the aft firewall assembly and seal assembly. This AD results from a report that firewall sealant may not have been applied between the aft firewall assembly and seal assembly during manufacture of certain Model 525 airplanes. We are issuing this AD to detect and correct missing firewall sealant between the aft firewall assembly and seal assembly, which could result in failure of the fire extinguishing system to prevent the spread of fire through the firewall gap. This failure could lead to an uncontrolled fire.

Airworthiness Directives; MORAVAN a.s. Model Z-143L Airplanes

Wed, Jun 11 2008 11:00:00 GMT

Vortex inserts are used inside the heat exchanger of the carburettor heating system. Up to serial number (s/n) 0044 inclusive those inserts have been produced from aluminium alloy which has been found to be susceptible of cracks. As a consequence, if left uncorrected some loose parts could migrate in the induction system, reduce the air flow through the carburettor's venturi and lead to a loss of engine power.

From s/n 0045 onwards vortex inserts have been produced from stainless steel.
We are issuing this AD to require actions to correct the unsafe condition on these products.

Airworthiness Directives; Rolls-Royce Corporation AE 3007A1E and AE 1107C Turbofan/Turboshaft Engines

Wed, Jun 11 2008 11:00:00 GMT

The FAA proposes to adopt a new airworthiness directive (AD) for RollsRoyce Corporation (RRC) AE 3007A1E and AE 1107C turbofan/ turboshaft engines. This proposed AD would require removal from service of certain 2nd stage, 3rd stage, and 4th stage compressor wheels, compressor cone shaft assemblies, and 1st to 2ndstage turbine spacers, at new, reduced, published life limits. This proposed AD results from RRC applying an updated lifing methodology to the affected parts. We are proposing this AD to prevent lowcyclefatigue (LCF) failure of the parts listed in Table 1 of this proposed AD, which could result in an uncontained engine failure and damage to the aircraft.

Agency Information Collection Activity Seeking OMB Approval

Wed, Jun 11 2008 11:00:00 GMT

The FAA invites public comments about our intention to request the Office of Management and Budget's (OMB) approval of a new information collection. The Federal Register Notice with a 60day comment period soliciting comments on the following collection of information was published on March 20, 2008, vol. 73, no. 55, page 15042. This project involves the random and representative sampling of Flight Attendants currently employed by U.S. air carriers.