Gen II
User Manual
12-4 – Honeywell Performance
Chapter 12
Revision 2.20,
20
12.1.1.1.
Datalogger (JEDA)
The Model 1752B JEDA is a compact datalogger, which enables you to collect data from any
EEC or N2 DEEC equipped TFE731 engine model.
12.1.1.2.
JEDA Communications Cable
This is the communications cable that enables the Viper II Analyzer to control the JEDA unit via
a serial communications link. The communications cable between the Viper II Analyzer and the
JEDA unit includes an in-line USB-to-RS422 converter and is approximately 70 feet long to
accommodate all known airframe applications. The USB-to-RS422 converter is molded in line
at the Viper II Analyzer end of the cable near the end of the cable marked “ANALYZER”. This
cable connects to the mating connector labeled “STRB/ JEDA/ACCY” on the analyzer.
12.1.1.3.
EEC, N2 DEEC, and N1 DEEC Comm Cable(s)
The Honeywell Performance software will accommodate all TFE731 engine types. The EEC
harness is connected to the engine EEC computer and to the JEDA unit. The connection at the
computer also passes the signals through to the engine normally except for the T5 connection,
which is opened by the JEDA unit. For this reason, the EEC or DEEC harness must never be
attached independently to the engine computer (that is without also being connected to the JEDA
unit) to prevent a possible overtemp during engine start. The N2 DEEC harness is used in the
same fashion as the EEC harness. Both the EEC and DEEC harness are the only cables required
to be connected to EEC and N2 DEEC computers to collect the calibration data. The Standard
N1 DEEC Comm cable is a generic design that connects directly to the J2 connection of the N1
computer and either to the JEDA or to the EMS Direct Connect cable. Engine/airframe specific
cables are necessary for access to the computer where other means of communicating with the
computer are not available. There are specific designs for the airframes listed in the figures
above. When collecting data from either the 8002-60 or 8002-62 computers, you must also use
the N2 DEEC harness cable (10-320-0239) in conjunction with the –60/-62 N1 DEEC Comm
cable, 10-320-0274. The two cables are necessary to: 1) control the computer (-60/-62 N1
DEEC Comm Cable) and 2) to facilitate a faster acquisition speed (N2 DEEC breakout cable)
from these older design N1 Computers. The 60/62 N1 DEEC computers are the only N1 DEEC
computers that cannot be connected directly to the Viper II analyzer for completion of a
performance run due to the slower data rate available from those computers.
12.1.1.4.
Ambient Temperature Probe and Cable
The Honeywell Performance software design dictates that you must have an ambient temperature
sensor and connecting cable installed for all performance runs. There are two cable designs.
Each design is unique to its use, either for use with the 1752B JEDA unit (PN 10-320-0232) or
directly to the AUX/COMM connector of the Viper II when using EMS direct connections (PN
10-320-0347). The ambient temperature sensor (PN 10-200-0214) can be used with either cable
and is placed in a shaded area near the engine and secured to prevent ingestion into the engine or
damage due to movement caused by jet blast or wind. The appropriate cable then connects the
sensor to the JEDA unit or directly to the AUX/COMM input on the Viper II when used with N1
DEEC Direct Connect applications.
