Device (TSD) - 747
(TSD) STC #ST00848SE
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
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.
- 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
800147-112 (Circular Connector)
800037-112 (Rectangular Connector)