Falcon Spring 1999

• Do You Know Your Oil Type And Oil Change Interval?
• Thinking About An N Number Change?
• Take Good Care Of Your APU
• Hard To Find Batteries
• Falcon 10 SB 280 Rev. 1

Do You Know Your Oil Type And Oil Change Interval?

TFE731 engines that have incorporated ceramic No. 4 & No. 5 seal runners per Service Bulletins TFE731-72-3596, TFE731-72-3597, or TFE731-72-5111, are now required to use Mobil 254 oil when servicing the oil system. In addition, the Mobil 254 oil must be changed at an interval not to exceed 450 +/- 50 hours. Following incorporation of the above referenced SB, there were 16 failures of ceramic seal runners, all on engines using oils other than Mobil 254. It was determined that accumulated coke from the oil came into contact with the ceramic seal runners causing the runners to fail.

Mobil 254 oil has shown less tendency to form coke than any of the other previously approved oils. If oil other than Mobil 254 has been, or is currently being used, the oil must be replaced with Mobil 254. Service Information Letter F731-89 gives the pertinent details of the requirements and procedures to be followed to comply with this requirement.

For more info about this development, contact Jeff Manion in Lincoln at 800.2284277 or Roger Courey in Battle Creek at 800.525.2376.

Thinking About An N Number Change?

If you plan on changing the registration number of your aircraft and you currently have an LOA (Letter of Authorization) to operate your aircraft in the North Atlantic Minimum Navigation Performance Specification airspace, then prior to changing the registration number, you must notify the Flight Standard District Office that issued your LOA of your intentions. They will contact the manager of the FAA RVSM database who will update the FAA RVSM records and notify the International Civil Aviation Organization about the change in your number.

For more information, please contact Dave Pleskac, Ron Hall or Gary Harpster in Lincoln at 1.800.228.4277, or Bob Stickler or Dennis DeCook in Battle Creek at 1.800.525.2376.

Take Good Care Of Your APU

Like other turbine engine parts, the life and reliability of an APU can be enhanced by how the unit is installed, operated and serviced. The life of an APU can be extended by ensuring that the unit is serviced and operated in accordance with manufacturer’s recomendations. Fuel filters and fuel nozzles must be kept clean. A dirty nozzle can lead to carbon buildup. Carbon buildup can lead to hot-section damage and reduce the life of your APU.

For more information, please contact John Kennedy in Lincoln at 1.800.228.4277, or Dan Arrick in Battle Creek at 1.800.525.2376.

Hard To Find Batteries

Some Falcon 900’s have a Dorne & Margolin ELT installed which could include a lighted switch in the cockpit. This light illuminates when the ELT battery charge is low, if the ELT or wiring is disconnected or if the ELT is in the “ON” position. This light is powered by a small battery in the switch box. The switch box has a placard stating that a P/N DMU264-1 battery be used. This battery is very hard to find.

Duracell‘s P/N 2L76 battery may be used as an alternative battery. It conforms to the Dorne & Margolin P/N DMU264-1 battery. These batteries are available through Aviall. For more info, please contact Jeff Manion in LNK at 1.800.228.4277, or Roger Courey in BTL at 1.800.525.2376.

Falcon 10 SB 280 Rev. 1

Dassault Aviation has revised SB 280, which installs the “NO TAKE OFF” lights on the instrument panel. This revision has changed the compliance to mandatory status and French AD 98-547-022B was issued.

For operators who have not yet complied with this SB, Dassault has a special program to install the kit free of charge (both labor and parts). This program will continue through September 30, 1999.

For more information, please contact Jeff Manion in Lincoln at 1.800.228.4277, or Roger Courey in Battle Creek at 1.800.525.2376.

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