He said that their protocol was to fly at around 7,000-8,000 feet, but during foul weather they were to descend to stay below the clouds and would fly right through the storms. As the R4D was unpressurized and did not carry oxygen, this was their only recourse. Here is the report from the U.S. Navy on their last flight. R4D-6 Bu No #50770

r4d-6 改用 漢米敦標準 （Hamilton Standard）螺旋槳的R4D-5，在1962年改名為 C-47J ， R4D-6L 、 Q 、 R 、 S 及 Z 型與R4D-5系列相同，亦在1962年改名為 LC-47J 、 EC-47J 、 TC-47J 、 SC-47J 及 VC-47J

米海軍のダグラスr4d-6輸送機は、米空軍のc-47bと同じ形式で、高々度用の二速過給器をつけたp&w r-1830-90cエンジンを搭載し、キャビンには兵員28人までのベンチシートあるいは燃料タンクなどが積載可能で、暖房ヒーターを増強した機体で、ダグラス社の ...

The R4D-6's were identical to the R4D-5 but were equipped with two 1,200 hp Pratt & Whitney R-1830-90C engines with two-stage, two-speed superchargers, provisions for fuel tanks in the fuselage and improved heaters.

R4D-6 "SKYTRAINII R4D-6 . SERVICE ASPECT RATIO 15 AUGUST 1948 R4D- Navy DESCRIPTIVE 6 . MISSION AND DESCRIPTION The Douglas SWtrai.n is a transport similar to R4D—5. A later version Of R4D—5 distingu.IsYEd from it Its engines, being GMDE.... . DIMENSIONS IA.ad±ngs WEIGHTS Lbs. SERVICE POWER PLANT

Transferred to the Navy as R4D-6 Bu No. 50788 Leaving military service for the FAA in 1958 as N49, other registrations include N2006J and N235GB. Acquired by Lonestar Flight Museum in Texas, USA as part of Rick Sharp's Vietnam War Flight Museum collection

Constructed as a C-47B-15-DK by Douglas at Oklahoma City, Oklahoma, USA. New construction number, 26558, assigned to the airframe. Taken on Strength/Charge with the United States Army Air Force with s/n 43-49297. Taken on Strength/Charge with the United States Navy with BuNo 50788 as a R4D-6. To US DOD with new c/r N7678C.

R4D-6S: R4D-6's converted post World War II to antisubmarine warfare (ASW) trainers with space for nine students and one instructor. Redesignated SC-47J in 1962. R4D-6T: R4D-6's converted to navigational trainers.

Intended to be a C-47B (43-49012) for the USAAF, the aircraft was delivered to the Navy as an R4D-6, serial 50761. It was later re-designated as an R4D-6Q. It was transferred to the Army in 1958, then in 1962 was again re-designated as an EC-47J. After retirement from military service it was transferred to the US Departmet of Agriculture in 1976.