Installation Manual

Lynx NGT-9000
Installation Manual
0040-17001-01 (Revision W) Appendix D Page D-12
D.4 FAILURE CLASSIFICATION
Table D-3 summarizes the potential hazards associated with the Lynx NGT-9000 functions and the
associated failure condition severity classifications per AC 23.1309-1E. Hazards with classifications less
than Major are not listed in this table.
Table D-3: Failure Classification
Functional Description
Hazard Classification
Failure Condition
TAS Traffic Advisory
TCAS Traffic Advisory
Major
AC 120-55C, §12.b.(1)
TSO-C118a §3.b (1)
Relative position of traffic associated with
Traffic Advisory is incorrectly indicating
(either visually or aurally or both).
Per operational procedures, crew will not
deviate from assigned clearance based only
on TA information.
Confusion of crew to locate traffic
associated with advisory.
Significant increase in workload on crew.
ATAS Traffic Alert
AC 20-172B, § 2-8.d.
TSO-C166b, § 3.b
TSO-C154c, § 3.b.
TSO-C195b, § 3.b
Incorrect ATAS alerts given to the flight
crew.
Incorrect visual cues are displayed, and/or
misleading aural alerts provided.
Crew confusion with traffic situation.
Flight crew uses visual cues and ATC traffic
advisories or instructions to avoid traffic.
Significant increase in crew workload.
Mode S Transponder
Response to SSR and
TCAS interrogations
Major
TSO-C112d §3.b.
Incorrect reply to an SSR or TCAS
interrogation.
Significant reduction in safety margins or
functional capabilities
ADS-B Output
Major
AC 20-165B, Appendix 1, §cc
TSO-C166b, § 3.b
TSO-C154c, § 3.b.
Incorrect position or velocity data reported
to ground surveillance system providing
aircraft separation services.
Significant reduction in safety margins.
Enhanced Visual
Acquisition (EVAcq)
Basic Airborne Traffic
Situational Awareness
(AIRB)
Major
AC 20-172A, § 2-7.d.
TSO-C166b, § 3.b
TSO-C154c, § 3.b.
TSO-C195a, § 3.b
Traffic is incorrectly displayed relative to
own ship position on the CDTI or displayed
traffic information is incorrect.
Crew confusion with traffic situation.
Flight crew uses visual cues and ATC traffic
advisories or instructions to avoid traffic.
Significant increase in crew workload.
Class B TAWS Mode 1
False Warning Alert
AC 23-18 §7.d(2)(b)
False warning alert due to undetected or
latent failures. Crew confusion with terrain
situation. Crew initiates corrective maneuver
immediately
Significant increase in crew workload
Class B TAWS Mode 1
Un-annunciated loss of
both Aural and Visual
Alert
AC 23-18 §7.d(2)(c)
Failure of the function to provide the
required alerting functions. Crew uses visual
clues and any other available information to
avoid terrain. Increased risk of CFIT.
Significant increase in crew workload