Two modified B-47Es (52-410 and 52-412), redesignated EB-47E, were loaned to the US Navy
for electronic warfare tests. The long-range external wing tanks were
replaced with a variety of pods filled with electronic countermeasures
equipment, and more chaff dispensers were installed.
They were assigned the BuNos of 24100 and 24102 respectively, which conflicted
with a batch of WW2 Grumman TBF Avengers. These two planes
remained operational with the Navy long after after the last USAF
B-47s had been retired. They were finally retired in December of 1977.
Some references list a third Navy EB-47E, 53-2104.
The designation EB-47E was also applied to a number of USAF electronics countermeasure conversions
of the standard B-47E. The first of these was equipped with what was known as the Phase IV (or Blue
ECM package, consisting of 16 AN/ALT-6B electronic jammers mounted on a cradle inside the bomb bay.
Phase V aircraft carried a pressurized capsule inside the bomb bay that carried two electronics
warfare officers that operated a suite of up to 13 different jammers that could focus on specific threats.
Not much is known about the USAF EB-47E program, but it is believed that up to 40 B-47Es were converted
to either Phase IV or V standard.
American Combat Planes, Third Enlarged Edition, Ray Wagner, Doubleday,
Post World War II Bombers, Marcelle Size Knaack, Office of Air Force
The Boeing B-47, Peter Bowers, Aircraft in Profile, Doubleday, 1968.
Boeing Aircraft Since 1916, Peter M. Bowers, Naval Institute Press,
United States Military Aircraft Since 1909, Gordon Swanborough and
Peter M. Bowers, Smithsonian, 1989.
Boeing B-47 Stratojet--Variant Briefing. Bill Yenne, International Air Power Review, Vol 6, 2002.