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Test and Evaluation of an Enroute System Terrain-Avoidance Function with the NAS A3d2.1 System

This report reflects the results of an effort at the National Aviation Facili— 
ties Experimental Center to test and evaluate an enroute system terrain— 
avoidance function in conjunction with the National Airspace System Enroute 
Stage A Model 3d2 system. 
The operational program tape used throughout testing was developed for the 
A3d2.1 system. Discrepancies recorded were 1 to the terrain—avoidance 
function and/or design in a simulated low—altitude environment. Results, con— 
clusions, and recommendations contained in this report are operationally 
oriented and do not consider program size and processing time requirements as 
a func tion of the overall system, nor do they consider implementat ion— 
associated fac tors.

PURPOSE. 
The purpose of this activity was to test and evaluate the operational suit— 
ability of an enroute minimum safe altitude warning (E—MSAW) function utiliz— 
ing the model 3d2.1 program of the National Airspace System (NAS) . 
This report 
discusses the method used and results obtained Of the test and evaluation of 
the E—MSAW function conducted in the System Support Facility (SSF) at the 
Na t ional Aviation Facilities Exper imental Center (NAFEC) 
BACKGROUND . 
The E—MSAW function, which provides the radar controller With a displayed 
warning of a potential collision between a tracked aircraft under his control 
and terrain and/or ground obstructions, was developed and built into the NAS 
Model A3d2.1 system, also containing the conflict alert (CA) function. This 
was done to make maximum use of, and to be consistent with, the logie Of CA. 
A series Of program validation tests Of the 3d2.I prce•rr.m with E—MSAW was 
Based on the favorable 
conducted in the SSF at NAFEC by ARD—140 personnel. 
results of this testing, a series Of operational system tests Of the E—MSAW 
function was scheduled for conduct by NAFEC, ANA—110. NAFEC 0 verational 
system test activity was conducted between December 11, 1975, and June 23 , 
1970.