We have seen the written evaluations of Tanker 911, one of the DC-10 very large air tankers, for some of the retardant drops the aircraft completed on fires in Arizona and Utah in June and July. The forms were signed by individuals identifying themselves as lead plane pilots.
The evaluation form consists of two parts; a narrative section, and assigning a grade for specific aspects of performance: Reload Turn Times, Maneuverability, Steep Terrain Operations, Drop Patterns, and Uniformity of Coverage. All of the grades were “Above Average” or “Exceeded Expectation”.
Here are the details that were hand written in the narrative section on the forms:
Poco Fire, Phoenix, Arizona; Gallons Delivered 11,700 x 6; June 16-19, 2012
- Six loads
- All drop patterns were good and uniform. Flat and steep terrain – excellent performance in all profiles.
- CL [Coverage level] 6 utilized in timber and mixed brush.
- Quantity and mass of load delivered allowed for higher than standard drop altitudes to minimize exposure in challenging terrain and still achieve good pattern on the ground.
- Quantity delivered also means 1 pass, 1 exposure instead of 7 from a legacy platform carrying 2,000 gallons!
- Very uniform and consistent pattern on the ground. Very accurate starts. Performed some split loads as needed.
Fox Fire, Tucson, Arizona; Gallons Delivered 11,700 x 2; 2 loads; 3 drops; June 18, 2012
- 1 – CL 6 – Split Load – Started and stopped to tie in a road in front of structures. Very accurate start and stop. Last 2,000 gal reinforced first drop.
- 2 – CL 4 – One drop. Excellent coverage! It would have taken 6 or 7 loads from a legacy platform to get same length of line.
- Quick effective line production.
Six Shooter Fire, Globe, Arizona; Gallons Delivered 11,700; 1 load; 8 drops; June 17, 2012
- This was an initial attack fire. The location of this 5-acre fire, 1,500 to 2,000 ft below a ridge line, necessitated a substantial decent profile to get over the target on speed and altitude. The DC-10 was very capable and provided excellent coverage on and around the entire fire. The fire was successfully stopped at the same perimeter when the tanker dropped!
- Excellent drops and performance.
Shingle Fire, Cedar City, Utah; Gallons Delivered 11,700 x 4; 4 loads; July 2-3, 2012
- CL 6
- Good coverage and line production. Excellent pattern on the ground and saved lots of time vs utilizing smaller aircraft. We would not have been able to get the line needed done without this tool.
- Long turn arounds loading at [illegible; looked like “IVA”, “IWA”, or “IUA”]. 2 hour flights but dollars/gal still comperable considering speed and gallons!