In re Crash of Aircraft N93PC on July 7, 2013, at Soldotna, Alaska

District Court, D. Alaska·Decided April 21, 2020·No. 3:15-cv-00112·Unknown

Opinion

WO IN THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF ALASKA

In re Crash of Aircraft N93PC ) No. 3:15-cv-0112-HRH ) [Consolidated with on July 7, 2013, at Soldotna, Alaska ) No. 3:15-cv-0113-HRH and _______________________________________) No. 3:15-cv-0115-HRH]

O R D E R RAC’s Motion to Strike Colin Sommer’s August 2, 2019 Affidavit Defendant Recon Air Corporation moves to strike the August 2, 2019 affidavit of Colin Sommer.1 Defendant Texas Turbine Conversions, Inc. joins in this motion.2 This motion is opposed.3 Recon Air has withdrawn its request for oral argument,4 and the court

deems oral argument unnecessary. Background On July 7, 2013, a deHavilland DHC-3 “Otter” airplane operated by Rediske Air, Inc. and piloted by Walter Rediske crashed shortly after take-off from the Soldotna Airport.

1Docket No. 291. 2Docket No. 322. 3Docket Nos. 318 and 319. 4Docket No. 358. -1- Rediske and all of the passengers on board were killed in the crash. Plaintiffs, which are the estates of the passengers and Rediske, assert wrongful death, negligence, strict liability and

breach of warranty claims against defendants Recon Air and Texas Turbine Conversions. The subject aircraft was modified in 2010. The modifications were approved under Supplemental Type Certificates (STCs) and included a Texas Turbine Engine Conversion and a Baron Short Takeoff & Landing (STOL) kit. The engine conversion included the installation of a Honeywell TPE331 turbine engine. Recon Air installed both the engine and

the Baron STOL kit. Colin Sommer is one of plaintiffs’ retained experts. On December 22, 2016, Sommer’s original expert report was disclosed. In that report, Sommer offered eleven opinions:

1. Pilot Rediske was qualified and properly certificated to act as pilot in command of N93PC during the subject flight. 2. The witness statements and video evidence of the crash are supportive of an inflight engine failure compounded with an aft center of gravity, which resulted in loss of the control of the aircraft. 3. Installation of the STOL kit by Recon changed the center of gravity envelope for the aircraft. The aft of limits center of gravity during the subject flight was exacer- bated by the STOL kit installation. 4. The torsion shaft aft bushing failed and caused heavy damage and scoring to the torsion shaft aft bushing land. 5. The torsion shaft runout was far beyond normal specifi- cations for type of application. 6. The torsion shaft in the subject Honeywell International, Inc. TPE331-10R-511C failed in-flight, shortly after departure from the Soldotna Airport in Soldotna, AK. -2- This is evidenced by the damage to the torsion shaft aft bushing land and condition of the inner diameter of the main shaft. 7. The condition of the compressor impellers and turbine wheel assemblies is consistent with an engine that was not producing power at impact. There was relatively little damage to the tips of the turbine blades, all turbine blades remained securely attached to the wheels and the convex surfaces of the turbine blades didn’t contain a significant amount of metal spray. 8. The post-crash condition of impeller blade leading edges and lack of foreign object damage to the impeller is further evidence that the engine was not producing power when it impacted the ground. 9. Michael Selhay noted in his initial investigation a lack of metal spray and lack of foreign object debris (FOD) damage in the engine, both of which support an engine failure. Honeywell later changed their opinion to include evidence of metal spray and FOD damage when they submitted their report to the NTSB. 10. The propeller showed signatures of low power and high RPM at the time of impact. 11. Due to the sudden reduction in engine power with the aircraft in a climb attitude and an aft of limits CG, the aircraft pitched up and stalled. Pilot Rediske was unable to recover prior to impact.[5] On August 30, 2017, Sommer was deposed. At his deposition, Sommer disclosed several additional opinions, including 1) a weight and balance calculation,6 2) an opinion that “according to Advisory Circular 20-188 . . . [i]t is the responsibility of the installer to determine whether a design change is compatible with previously approved 5Report of Findings, Exhibit A at 21-22, Memorandum in Support of RAC’s Motion to Strike Colin Sommer’s August 2, 2019 Affidavit, Docket No. 292. 6Deposition of Colin Sommer at 27:17-20, Exhibit B, Memorandum in Support of RAC’s Motion to Strike Colin Sommer’s August 2, 2019 Affidavit, Docket No. 292. -3- modifications[,]”7 3) a calculation of a station location for the center of gravity on the accident flight,8 and 4) an opinion that “Recon should have done flight testing to establish what the new flight envelope was, given the fact that they implemented multiple STCs. . . .”9

Sommer testified that the foregoing were simply support for the opinions expressed in his expert report because “some of my opinions in my report were somewhat broad. And in my deposition, as is customary, I gave all of the details and support and referenced all of the different documents that I used to develop those opinions in detail.”10 Sommer testified that

he had “the opinion that just the aft center of gravity alone without the loss of the engine would not have resulted in an accident.”11 Sommer testified that absent the engine failure, the accident flight would have been a successful flight.12 On December 11, 2017, a rebuttal report by Sommer was disclosed.13 Sommer stated

that his rebuttal report was “being issued to address the opinions set forth within Dr. Orloff’s

7Id. at 29:12-17. 8Id. at 34:4-9. 9Id. at 144:12-14. 10Id. at 134:14-22. 11Id. at 34:20-22.

12Id. at 180:6-15. 13Exhibit C, Memorandum in Support of RAC’s Motion to Strike Colin Sommer’s August 2, 2019 Affidavit, Docket No. 292. -4- report relating to the crash of N93PC[.]”14 In his rebuttal report, Sommer opined that “Recon Air’s failure to determine compatibility of the installed STC’s is a proximate cause of this crash.”15

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In re Crash of Aircraft N93PC on July 7, 2013, at Soldotna, Alaska, (D. Alaska 2020).

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