ACSS Introduces T2CAS Traffic and Terrain Collision Avoidance System.

Business Editors

PARIS--(BUSINESS WIRE)--June 20, 2001

T2CAS(TM) Combines TAWS and TCAS In One

ACSS, an L-3 Communications (NYSE: LLL) & Thales Company, today introduced its Traffic and Terrain Collision Avoidance System (T2CAS(TM)), a safety avionics system that integrates aircraft performance-based Terrain Avoidance Warning System (TAWS) capability into ACSS's Traffic Alert and Collision Avoidance System (TCAS). Current TCAS II operators can upgrade their existing system to incorporate the T2CAS capability.

This new product, which will be available in late 2002, is currently on display along with other ACSS products at the L-3 exhibit at the Paris Air Show, Le Bourget, France, Hall 4, Stand B3.

T2CAS provides aviation customers with a unique combination of functionality, along with optional GPS and Windshear, without the size and weight of competing systems. It also meets all the important terrain safety standards required by the TAWS mandate (TSO C151a and C117a standards).

"The T2CAS combines our industry leading TCAS 2000 with Thales Avionics' 25 years of expertise in high performance terrain avoidance systems," said Joe Hoffman, president of ACSS. "T2CAS can be applied to any aircraft to avoid Controlled Flight Into Terrain (CFIT) and give operators time to clear the hazard with plenty of margin."

T2CAS incorporates an important safety function, which eliminates nuisance conflict warnings and alerts. It is the only TAWS product available to provide avoidance alerts based on actual aircraft performance data rather than based on standard climb rates and an assumption that all critical functions are performing properly. For example, if one engine on an aircraft goes out while it is approaching a mountain, T2CAS will factor in the decreased performance while accurately alerting pilots of any necessary avoidance maneuvers.

Through T2CAS, aircraft operators can add TAWS without adding a LRU, if the TCAS 2000 is already part of their safety avionics package. This solution provides them with lower cost of ownership without having to allow for additional space and weight. T2CAS is also backward compatible for operators using ACSS's first generation TCAS II.

T2CAS combines ACSS's TCAS 2000 with TAWS and Windshear software developed and certified by Thales Avionics. ACSS is responsible for producing and supporting the T2CAS, and leads the marketing and sales effort to the corporate, general aviation and military markets. ACSS will also develop and test the aircraft-specific software and lead the hardware design and quality testing. Thales will develop the terrain and aircraft performance databases, and lead sales and support for airlines.

ACSS (Aviation Communication & Surveillance Systems), an L-3 Communications & Thales Company, is a leader in safety avionics systems. ACSS products include the TCAS 2000 and TCAS 1500 traffic alert and collision avoidance systems, a family of Mode S transponders and the T2CAS, a combined traffic and terrain collision avoidance system. TCAS reduces the potential for mid-air collisions and provides an independent and complementary supplement to the air traffic control system. More than 8,000 units of ACSS's TCAS product are currently operating in commercial, corporate and military aircraft.

Headquartered in Velizy (France), Thales Avionics, a wholly-owned subsidiary of Thales, is the European leader and world-renowned partner in avionics and cabin electronics and a world leader in professional electronics for civil and defense markets. To learn more about Thales Avionics, please visit the company's web site at www.thales-avionics.com.

Headquartered in New York City, L-3 Communications is a leading merchant supplier of secure communications systems and products, avionics and ocean products, training products, microwave components and telemetry, instrumentation, space and wireless products. Its customers include the Department of Defense, selected US government intelligence agencies, aerospace prime contractors and commercial telecommunications and wireless customers. To learn more about L-3 Communications, please visit the company's web site at www.L-3Com.com.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995: Except for historical information contained herein, the matters set forth in this news release are forward-looking statements. The forward-looking statements set forth above involve a number of risks and uncertainties that could cause actual results to differ materially from any such statement, including the risks and uncertainties discussed in the company's Safe Harbor Compliance Statement for Forward-looking Statements included in the company's recent filings, including Forms 10-K and 10-Q, with the Securities and Exchange Commission.