Unbelted Components

The following is derived from maintenance facility submissions to the FAA's Service Difficulty Reports database


Cessna TU206G Stationair

Sheared Alternator Belt

Pilot heard a squealing sound at engine start. Voltmeter showed discharge. The alternator belt was found sheared and was replaced.

Part total time: 370.0 hours

Cessna 207 Skywagon

Stretched Alternator Belt

Alternator belt (p/n 5395473119) will not hold tension. It will stretch from a proper tension in a short period of time, 10-25 hours.

Part total time: 199.0 hours

Cessna 208 Caravan

Broken Air Conditioning Belt

During departure, the captain detected a burning odor and elected to return and land. Maintenance found the air conditioner belt broken and rubbing on the air conditioning compressor pulley, causing the odor. Replaced broken belt and returned aircraft to service.

Part total time:  Unknown

Cessna 208B Grand Caravan

Broken, Rubbing A/C Belt

Pilot noticed smell of burnt rubber, followed by smoke in the cockpit. Air conditioning belt had broken and was rubbing on the compressor pulley.

Part total time: Unknown

Diamond DA42 Twin Star

Incorrect Belt Installation

Right alternator failed and engine coolant temperature rose. The crew shut down the right engine and feathered its propeller. Aircraft diverted. V-belts had recently been replaced on both engines. Investigation revealed possible incorrect installation of both V-belts.

Part total time: Unknown

Piper PA-28-181 Archer II/III

Mismanufactured Belt

Alternator failed in flight due to a broken alternator pulley. With idler pulley adjusted, the belt is too short to allow appropriate tension.

Part total time: Unknown

Piper PA-31-350 Navajo Chieftain

Wet Alternator Belt

Right engine charging system failed in flight as the airplane experienced heavy rain. The right alternator’s location puts it directly into the path of the oncoming rain. It appears the alternator belt got excessively wet and started slipping, causing the belt teeth to tear off. The belt was replaced and the system tested serviceable.

Part total time: 216.0 hours

Piper PA-32-300 Cherokee Six

Broken Alternator Belt

The aircraft lost all electric power due to alternator belt breaking. All narrow belts are installed on factory-installed air conditioning. Alternator drive belt conversion kits, p/n 767310, need to be installed IAW service letter 104C.

Part total time: Unknown


Please enter your comment!
Please enter your name here