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Traffic Advisory System Evaluation. Goodrich SkyWatch SKY 497 Cirrus SR - 22. MortenAndersenMassimo Salciccia. Objective - Purpose. General Execute a Limited Evaluation of SKY 497 Not an approved TCAS-II system However similar displays / alerts Is it a viable system?? - PowerPoint PPT Presentation
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NTPS
Traffic Advisory SystemEvaluation
Morten Andersen Massimo Salciccia
Goodrich SkyWatch SKY 497Cirrus SR - 22
2 NTPS
Objective - PurposeIntroductionMethodTest ResultsConclusionRecommend.
General
• Execute a Limited Evaluation of SKY 497
• Not an approved TCAS-II system
• However similar displays / alerts
• Is it a viable system??
Specific (AC 20– 131a)
• Basic GND test (Para. 3.f.1.i-ix)
• Basic FLT test (Para. 3.f.2.i-iv, vii-viii)
• Encounter test (Para. 3.f.3.i-v)
3 NTPS
Test TeamIntroductionMethodTest ResultsConclusionRecommend.
Test Team• Safety Pilot: ED• Pilot: Morten• FTE: Massimo
Mission Representative Operators• Like most GA operators – unfamiliar with TCAS• Yes - representative
4 NTPS
MissionIntroductionMethodTest ResultsConclusionRecommend.
Expected Mission of the Aircraft• General Aviation• SGL pilot concept – possible inexperienced• Fully IFR certified• Ceiling: 13000ft MSL• Normal cruise speed: 120 – 150 KIAS
5 NTPS
Test Item DescriptionIntroductionMethodTest ResultsConclusionRecommend.
• Cirrus SR 22 (Experimental)
• TAS SKY 497
• Production representative – YES!
6 NTPS
IntroductionMethodTest ResultsConclusionRecommend.
SKY497
operation
• Track 32 AC
• Display 8 AC
• Eff. range: 8 NM
• Aural + vis.Alerts
• No RA!
7 NTPS
InstrumentationIntroductionMethodTest ResultsConclusionRecommend.
• Intruder aircraftB-76 w. GPS
• Garmin 92• Aircraft Radios
8 NTPS
Test ConditionIntroductionMethodTest ResultsConclusionRecommend.
Aircraft• Both aircraft CG and weight - STD• Minor electrical problem w. Cirrus on start up
– Considered no factor
Weather• Wind / Velocity • 240° / 13Kts• Visibility > 50 Km
9 NTPS
Assumptions - LimitationsIntroductionMethodTest ResultsConclusionRecommend.
Assumptions• SR-22 production representative• Garmin 92 provides truth Data
Limitations• Only 1.5 Hrs Flight Evaluation
– Extensive test points req. to show compliance on a standard percentile confidence level
– Not possible – striving for a sound estimate• Only Day light evaluation
10 NTPS
Test ChronologyIntroductionMethodTest ResultsConclusionRecommend.
Test assignment 16th February 2005
Data Card Review 21st February 2005
Flight Test TAS 24th February 2005
Oral Report 25th February 2005
11 NTPS
Test MethodIntroductionMethodTest ResultsConclusionRecommend.
Ground Test Self Test Bearing Accuracy Test: +/- 15 deg
Observe wingman squawk on GND Sensor Failure
Pull CB’s
Electromagnetic Interference (EMI) Observe all instruments
Evaluate Controls & Display General impression
12 NTPS
Test MethodIntroductionMethodTest ResultsConclusionRecommend.
Basic Flight Test Interference with other Aircraft Systems
Observe VOR/GPS/Radios Aural Messages
Present / non-present Acceptable Volume and Intelligibility
With and without headset Confirm Valid & Usable traffic info during
maneuver ± 15° of pitch & ± 30° of Bank
Surveillance Range Traffic info out to 11NM
13 NTPS
Test MethodIntroductionMethodTest ResultsConclusionRecommend.
Planned Encounter Flight Test 2 x Head-on Test
Low & High Speed 2 x Crossing Test (90 deg) 2 x Converging Test
(45 – 60 deg) 1 x Overtaking Traffic
Method: Cirrus calls “Mark” Lat/Long/Baro/Track/GS
recorded
14 NTPS
Test MethodIntroductionMethodTest ResultsConclusionRecommend.
Subjective Rating Scale TAS improve your S.A with respect to other traffic? TAS display is easily read and easily distinguished? TAS controls are easy to use?
21 6543
DisagreeStrongly Disagree
Moderately Disagree
Moderately Agree
Agree Strongly Agree
NTPS
Test Results
16 NTPS
Ground TestIntroductionMethodTest ResultsConclusionRecommend.
Self Test Very satisfactory – expeditious test!
Bearing Accuracy Test: req. +/- 15 deg High confidence in accuracy Short range… Satisfactory
Sensor Failure – Pull CB’s System CB pulled – immediately “Fail” Satisfactory
Electromagnetic Interference (EMI) None observed Satisfactory
17 NTPS
Ground TestIntroductionMethodTest ResultsConclusionRecommend.
Evaluate Controls & DisplayDual Controls / Displays
Garmin 430: Too small a display Cumbersome controls
Avidyne: Good overview Easy to see display Full control
Overall: Very Satisfactory
18 NTPS
Flight TestIntroductionMethodTest ResultsConclusionRecommend.
Basic Flight Test Interference with other Aircraft Systems
Possible interference observed on Storm Scope Frequent Lightning Alert (RNG 200NM!) Unknown cause [R-2]
Aural Messages Only “Traffic, Traffic” in system Apparently worked per intention Satisfactory
Acceptable Volume and Intelligibility Easy to hear, with and without Headphones. Satisfactory
19 NTPS
Flight TestIntroductionMethodTest ResultsConclusionRecommend.
Basic Flight Test Valid & Usable traffic info during maneuvers
± 15° of pitch & ± 30° of Bank w. intruder Accuracy assessed accurate to within 15 deg
Track only observed lost twice during entire test Reacquired within ~5 seconds Satisfactory
Surveillance Range System spec: Traffic info out to 11NM Intruder and other traffic displayed at 11 NM Satisfactory
20 NTPS
Flight Test – Planned EncounterIntroductionMethodTest ResultsConclusionRecommend.
Head On Encounter
• 8 seconds too late – non compliance?• Maybe… maybe not!• Only one datapoint [R-1]
SR-22GS
B-76GS
Ang.Closure
Cal.Alert
Range
RealAlert
RangeDiff.
ErrorBudget
Time out ofSpec.
160kt 135kt 287kt 14530’ 9175’ 5355’ 1575’ 8 sec.
120kt 100kt 212kt 10735’ 10730’ 5’ Pass
TRK X-ING ANGLE
165° / 195°
21 NTPS
Flight Test – Planned EncounterIntroductionMethodTest ResultsConclusionRecommend.
Crossing Encounter
• Satisfactory!
SR-22GS
B-76GS
Ang.Closure
Cal.Alert
Range
RealAlert
RangeDiff.
ErrorBudget
Time out ofSpec.
150kt 130kt 215kt 10885’ 10585’ 300’ 1200’ Pass
TRK X-INGANGLE
100°
22 NTPS
Flight Test – Planned EncounterIntroductionMethodTest ResultsConclusionRecommend.
Converting Encounter
• Satisfactory!
SR-22GS
B-76GS
Ang.Closure
Cal.Alert
Range
RealAlert
RangeDiff.
ErrorBudget
Time out ofSpec.
127kt 130kt 117kt 5925’ 5550’ 375’ 700’ Pass
TRK X-INGANGLE
63°
23 NTPS
Flight Test – Planned EncounterIntroductionMethodTest ResultsConclusionRecommend.
Overtaking Encounter
• Satisfactory!
SR-22GS
B-76GS
Ang.Closure
Cal.Alert
Range
RealAlert
RangeDiff.
ErrorBudget
Time out ofSpec.
97kt 156kt 61kt 3040’ 2900’ 140’ 425’ Pass
TRK X-ING ANGLE
016°
24 NTPS
Test MethodIntroductionMethodTest ResultsConclusionRecommend.
Subjective Rating Scale TAS improve your S.A with respect to other traffic? TAS display is easily read and easily distinguished? TAS controls are easy to use?
21 6543
DisagreeStrongly Disagree
Moderately Disagree
Moderately Agree
Agree Strongly Agree
25 NTPS
ConclusionsIntroductionMethodTest ResultsConclusionRecommend.
Displays / Functionality / Usability• System is very easy to use• System gives good and instant SA on factor traffic• System seems consistent• Acceptable use of visual and auditory alerts• Possible interference with StormScope – should be
investigated [R-2]
26 NTPS
ConclusionsIntroductionMethodTest ResultsConclusionRecommend.
Specifications• All but one test run showed compliant values• High speed Head On Encounter failed.• Too many uncertainties to fail the system on one
test point. [R-1] • Generally – high confidence in system
27 NTPS
Overall ConclusionsIntroductionMethodTest ResultsConclusionRecommend.
The SKY 497 is estimated to be a
Viable and Usable
Traffic Alerting System in the role of
General Aviation
28 NTPS
RecommendationsIntroductionMethodTest ResultsConclusionRecommend.
[R-1] The High Speed Head On Encounter alerting function of the SKY 497 should be evaluated under further flight test.
[R-2] The SKY 497 should be investigated for possible interference with the Storm Scope system.
29 NTPS
Questions
30 NTPS
Error Budgets
• GDOP of 4: 60ft• 2 seconds time delay in Mark
– Gives error budget along angular closure vector
– For two aircraft!• 1 second update rate for GPS
– Gives error budget along angular closure vector
– For two aircraft
31 NTPS
Assignment
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