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Transient Suppression Device (TSD) - 747

(TSD) STC #ST00848SE
(issued 10-6-00)
AMOC for AD 98-20-40
Cost Effective Solution for Boeing 747 "Classic" Aircraft with Honeywell FQIS.

The Federal Aviation Administration issued Butler National Corporation, a worldwide leader in the aerospace and defense market, a Supplemental Type Certificate (STC) number ST00846SE on October 6, 2000. The STC approves the installation of its Transient Suppression Device (TSD) on Boeing 747 Classic Airplanes fitted with Honeywell Analog Fuel Quantity Indication Systems (FQIS). The STC is approved as an Alternative Method of Compliance (AMOC) for Airworthiness Directive (AD) 98-20-40, which requires protection for fuel tank wiring. Patent is pending for the TSD.

The FAA issued AD 98-20-40 requiring all classic 747 aircraft to have fuel tank protective devices installed prior to November 2001. This mandatory safety device is in response primarily to the investigation into the tragic July 17, 1996 in flight break-up of TWA Flight 800 off the coast of Long Island, New York, losing all 230 passengers and crew. It is believed that installation of such devices in the future may increase the safety of air travel for not only the Boeing 747, but other aircraft as well.

TSD Solution:
  • TSDs are available with short lead-times.
  • An inexpensive, easy to install AMOC to AD 98-20-40.
  • Passive TSD prevents unsafe levels of electrical energy from entering the fuel tanks on FQIS system wiring.
  • Installation can be completed during scheduled overnight maintenance (Typically less than 8 MAN HOURS).
  • The TSD is seamless to the Honeywell FQIS.

The Butler TSD is designed to interface transparently to the original equipment including on-going upgrades and enhancements.

Installation of the new Butler National TSD is FAA approved for approximately 413 Boeing 747 aircraft with the Honeywell FQIS (Series 747-100,-200,-300,-SP,and -SR). This Transient Suppression Device is designed to prevent potentially dangerous electrical energy on the FQIS wiring from entering any of the fuel tanks of the protected 747 aircraft.

Illustrated below are the types with connection and attachment details.

800147-112 (Circular Connector)

800037-112 (Rectangular Connector)

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