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Bonanza Standby Alternator System Components (STC-PMA)

Standby Alternator & Controller for the Bonanza (STC-PMA)
Standby Alternator & Controller for the Bonanza (STC-PMA)
Price: From $105.00 to $2,635.00
Item Number: Bonanza Standby System

Product Options

(14v) BC410-1 Alt + BC217-1A Reg + 410-500-3-2 Installation Kit . ($2,635.00)
(28v) BC410-1 Alt + BC203-2D Reg + 410-500-3-1 Installation Kit . ($2,635.00)
Large EL Panel 410-329 - For 1984 & later A36/B36TC ($495.00)
Small EL Panel 410-337 - For 1972-1983 A36 & 1970-1994 F33A ($550.00)
Factory A/C Casting Modification 410-322 ($150.00)
FAA 8130 Export Form (If Needed) ($105.00)

* denotes required field

Registration Number*
Serial Number*
Model Number*
Model Year*
Air Conditioning Installed*
OEM Generator currently installed?*
End-User Country

Reliable Standby Electrical Power for the Bonanza.

The B&C Standby Alternator system continues to earn the acclaim of Bonanza owners for its ease of operation and dependability. STC-PMA approved for installation on the J35 (1958 model) through the present-production A36, this system provides 20 amps of power to support continued flight in the event of primary alternator failure. Once activated, it operates in the background, automatically signaling its operation to the pilot through a panel-mounted annunciator light (which also doubles as a standby alternator load monitor).

If the primary alternator fails in flight, the controller will sense the drop in system voltage and automatically activate the standby alternator. If the current requirement is over 20 amps when the standby alternator is activated, the annunciator will flash. Reducing the current usage to 20 amps or less will cause the annunciator to cease flashing and illuminate in a steady state. The pilot may choose equipment needed for the given flight conditions by simply keeping the total load below the flashing point of the annunciator. This will reserve battery energy for transient loads, (gear, flaps, landing lights, etc) during approach. Loads may be beyond the flashing point of the annunciator for up to five (5) minutes without damaging the standby alternator.

Aircraft equipped with electroluminescent switch panels will need to have the nomenclature on the lower left hand "EL" panel changed during installation to comply with the FAR's. We have arranged with the OEM supplier of these panels to make a special production run, with correct nomenclature for our system. For 1984 and newer aircraft, new 5.25" x 17.00" "EL" panels are available with exchange. For 1972 to 1983 aircraft, a new 2.00" x 11.00" "EL" panel is also available with exchange.

Aircraft equipped with air conditioning require a compressor mounting bracket with a relief for alternator clearance. New aircraft or aircraft which have recently had this part replaced may already have the relief. If not, the bracket must be removed, stripped of all hardware and returned to B&C for modification at the above price, (this includes the STC). Every effort will be made to process the modification in a timely fashion, usually 48 hours or less.

The installation kit includes a STBY ALT ON annunciator, two standard pull-type circuit breakers (1 amp and 5 amp), “STBY ALT” field toggle-type switch, alternator gasket, alternator field connector, current sensor, wire, terminals, clamps, placards for each panel-mounted device, miscellaneous hardware, installation instructions, and flight manual supplement.


When ordering, please complete the STC Request Form and submit to B&C Specialty Products for issuance of STC paperwork.


ABS Article

Sales Information

Installation Pictures on a A36

Installation Pictures on a F33

14 Volt Regulator - BC217-1A

28 Volt Regulator - BC203-2D

Eligible Serial Numbers

Wiring Diagram without Stand-by Generator

Wiring Diagram with Stand-by Generator

Final Test Procedure

BC410 Outline Drawing

Installed Components

Installation Instructions (1958 - Present)

Installation Instructions Supplement (1984-1999) **Request via email


Aircraft not Covered by STC

For individuals interested in obtaining one-time field approvals on aircraft not yet covered by the STC, a general wiring diagram has been provided to assist in these efforts. We will continue to work on STC's for other models. A tremendous amount of time, money and paperwork is required to obtain these STC's. Please, let us know if you are interested in the standby alternator system for your aircraft and feel free to call if you have questions.


Instructions for Continued Airworthiness
B & C Specialty Products Model BC410 & BC425 Alternators

The B&C Model alternator requires no recurrent maintenance during its service life of 1700 Hours. It is recommended that at 1700 hours or less time in service or during engine overhaul the alternator be returned to B&C Specialty Products for factory overhaul. At each Annual or 100 hour inspection required by the FAA, check the alternator externally for security of mounting and wiring and perform the before takeoff test described under the "Normal Procedures" section of the Airplane Flight Manual Supplement;. Alternately, the Final Test described in the installation drawing may be used for this test. Failure due to broken wires or damaged connectors may be corrected in the field using repair procedures complying with the latest revision of AC43.13-xx. All other repairs are by replacement only.




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