April 16, 1996

Mission Objective

T-39 Flight 04

• To conduct near field sampling of the DC-8 exhaust plume.
• To provide emissions for the DC-8 to sample.

Flight Log

TAKEOFF/LANDING:
The T-39 separted SLN at 1705UTC and returned at 1953UTC

FLIGHT REPORT:
The T-39 accomplished a rendezvous with the DC-8 at 5kft approximately 3min. after takeoff. The aircraft then ascended together to 30kft, with the T-39 sampling the emissions of the DC-8 20 to 100 meters downstream. After the aircraft reached the CART site, the T-39 took the lead position to allow the DC-8 to obtain in situ measurements of its emissions.

METEOROLOGY-REPORT:

INSTRUMENT STATUS:

• CIMS - Not yet operational
• MS - Met/Nav system - WORKED
• AMS - Air Motion Sensor - WORKED
• NDIR - CO2 - WORKED
• 3760 - fine CN - WORKED
• 3025 - ultra fine CN - WORKED
• FSSP - 0.3-20um aerosols - WORKED
• PCASP - 0.1-3um aerosols - WORKED

Highlights

• The T-39 was able to fly at a fixed position only 20-50 meters behind the DC-8 and sample the exhaust of the individual inboard engines.
• Large concentrations of volatile ultrafine particles were observed in plumes < 0.5 second old.

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