April 30, 1996

Mission Objective

T-39 Flight 11

• To conduct sampling of the NASA 757 exhaust emissions under a variety of atmospheric conditions.

Flight Log

TAKEOFF/LANDING:
The T-39 departed SLN at 1708UTC and returned at 1941UTC

FLIGHT REPORT:
Departed SLN in formation with the B757 with the DC-8 trailing 10 Nm behind. Performed near-field sampling during ascends and at level at 18, 23, 31, 35, and 37 kft.

METEOROLOGY-REPORT:

INSTRUMENT STATUS:

• CIMS - mass spec - WORKED
• MS - Met/Nav system - Down for half of flight due to electrical problems.
• AMS - Air Motion Sensor - WORKED
• NDIR - CO2 - WORKED
• 3760 - fine CN - WORKED
• 3025 - ultra fine CN - WORKED
• FSSP - 0.3-20um aerosols - under repair
• PCASP - 0.1-3um aerosols - WORKED

Highlights

• Obtained the first near-field trace gas and aerosol sampling behind a B757 at cruise altitude.
• Recorded very interesting video of contrail dynamics and evaporation.

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