Douglas A-26 Invader
The Douglas A-26 Invader is an American twin-engined light bomber and ground attack aircraft. Built by Douglas Aircraft Company during World War II, the Invader also saw service during several major Cold War conflicts. A limited number of highly modified United States Air Force aircraft served in Southeast Asia until 1969. It was a fast aircraft capable of carrying a large bomb load. A range of guns could be fitted to produce a formidable ground-attack aircraft.
A redesignation of the type from A-26 to B-26 has led to confusion with the earlier and unrelated medium bomber Martin B-26 Marauder, which had already been withdrawn from service when the designation was reused.
Design and development
The A-26 was Douglas Aircraft's successor to the A-20 Havoc|A-20] Havoc, also known as Douglas Boston. Designed by Ed Heinemann, Robert Donovan, and Ted R. Smith, the innovative NACA 65-215 laminar-flow airfoil wing of the A-26 was the work of project aerodynamics expert A.M.O. Smith.The Douglas XA-26 prototype first flew on 10 July 1942 at Mines Field, El Segundo, with test pilot Benny Howard at the controls. Flight tests revealed excellent performance and handling but engine-cooling problems led to cowling changes and elimination of the propeller spinners on production aircraft. During testing, the nose wheel was found to be structurally inadequate, so it was strengthened.
The early A-26 versions were built in two forms
- The A-26B gun-nose could be equipped with a combination of armament, including.50 caliber machine guns, 20 or 37mm auto cannon, or an experimental 75mm pack howitzer. The 'B' gun-nose version housed six .50 caliber machine guns, officially the "all-purpose nose", later known as the "six-gun nose" or "eight-gun nose".
- The A-26Cs "glass" "Bombardier nose", contained a Norden bombsight for medium-altitude precision bombing. The A-26C nose section included two fixed M-2 guns, but those were eliminated after underwing gun packs or internal guns in the wings proved effective during colder weather.
Alongside the pilot in an A-26B, a crew member served as navigator and gun loader for the pilot-operated nose guns. In an A-26C, that crew member served as navigator and bombardier, and moved to the nose section to bomb. A few A-26Cs were fitted with dual flight controls, some parts of which could be disabled in flight for access to the nose section. Access for the bombardier was through the lower section of the right instrument panel; he normally sat next to the pilot. This was similar to British designs such as the Lancaster, Blenheim/Beaufort and Wellington. A tractor-style "jump seat" was behind the "navigator's seat". In most missions, a third crew member in the rear gunner's compartment operated the remote-controlled dorsal and ventral gun turrets, with access to-and-from the cockpit via the bomb bay only if that was empty. The gunner operated both dorsal and ventral turrets via a novel, complex and unreliable dual-ended periscope sight, a vertical column running through the center of the rear compartment, with traversing and elevating/depressing periscope sights on each end. The gunner sat on a seat facing rearwards looking into a binocular periscope sight mounted on the column, controlling the guns with a pair of handles on the sides of the column. Aimed above the centerline of the aircraft, the mirror in the center of the column 'flipped', showing the gunner a limited view similar to the view the upper periscope was seeing. As he pressed the handles downward, and as the bead passed the centerline, the mirror automatically flipped, transferring the sight "seamlessly" to the lower periscope. The guns aimed in the approximate direction the periscope was aimed, automatically transferring between upper and lower turrets as required, and computing for parallax and other factors. While novel and sound in principle, the developers invested a great deal of time and effort in their attempts to get the system to work, delaying production. As might be expected, the complex system was difficult to maintain in the field.
Operational history
World War II
Pacific
Douglas officially delivered the first production model A-26B aircraft to the United States Army Air Forces on 10 September 1943. These were sent for field evaluation in actual combat operations, with the Fifth Air Force in the Southwest Pacific theater. The A-26 first saw action on 23 June 1944, when four aircraft attached to the 3rd Bombardment Group's 13th Squadron, bombed Japanese-held islands near Manokwari. Aircrew from "The Grim Reapers", while evaluating these four A-26Bs, noted that downward views from the cockpit were significantly hindered by the nature of the design – especially the positioning of the engines – which made the A-26B unsuitable for its intended role of ground attack. In response to such evaluations, General George Kenney, commander of the Far East Air Forces, stated: "We do not want the A-26 under any circumstances as a replacement for anything." Nevertheless, development continued. While the 3rd BG was waiting suitably modified A-26s, it requested additional Douglas A-20 Havocs, although both types were used in composite flights.Some USAAF units in the Pacific that operated either the A-20 or B-25 Mitchell|B-25] received the A-26 for trials in limited quantities.
The 319th Bomb Group was fully converted to the A-26 in March 1945, when it commenced operations with the 3rd BG. In August, after a few dozen A-26 missions, it became evident that the war was coming to an abrupt close, and operations began to wind down. The 319th officially ceased combat operations on 12 August 1945.
Europe
Douglas needed better results from the Invader's second combat test, so ferried A-26s arrived in Europe in late September 1944 for assignment to the Ninth Air Force. The initial deployment involved 18 aircraft and crews assigned to the 553d Squadron of the 386th Bomb Group. This unit flew their first mission on 6 September 1944. No aircraft were lost on the eight test missions, and the Ninth Air Force announced they were satisfied, eventually replacing their A-20s and B-26s with the A-26 Invader.The first group to convert to the A-26B was 416th Bombardment Group. With it, they entered combat on 17 November, and the 409th Bombardment Group, whose A-26s became operational in late November. Due to a shortage of A-26C variants, the groups flew a combined A-20/A-26 unit until deliveries of the glass-nosed version caught up. Besides bombing and strafing, tactical reconnaissance and night interdiction missions were successful. In contrast to the Pacific-based units, the A-26 was well received by pilots and crew alike, and by 1945, the 9th AF had 11,567 missions, dropping 18,054 tons of bombs, recording seven confirmed kills while losing 67 aircraft.
In Italy, the Twelfth Air Force's 47th Bomb Group also received the A-26 starting in January 1945. They were used against German transport links, and for direct support and interdiction against tanks and troop concentrations in the Po Valley in the final campaigns in Italy.
Postwar era
United States
With the establishment of the United States Air Force as an independent service in 1947, the Strategic Air Command operated the again redesignated B-26 as an RB-26 reconnaissance aircraft in service 1949 to 1950. U.S. Air Forces in Europe continued operating the B-26 until 1957. Tactical Air Command operated the aircraft as both a B-26 and later designated back to A-26; the final variant was designated B-26K until 1966, then it again became the A-26A. This final version continued in service through the late 1960s with active-duty special-operations TAC units, and through 1972 with TAC-gained special-operations units of the Air National Guard.The U.S. Navy obtained Invaders from the USAF to use these aircraft in their utility squadrons for target towing and general utility until superseded by the DC-130A variant of the C-130 Hercules. The Navy designation was JD-1 and JD-1D until 1962, then the JD-1 was redesignated UB-26J. The JD-1D was also used under the designation of DB-26J. The CIA also used the type for covert operations.
The last A-26 in active US service was assigned to the Air National Guard; that aircraft was retired from military service in 1972 by the USAF and the National Guard Bureau, and donated to the National [Air and Space Museum].
Korean War
B-26 Invaders of the 3rd Bombardment Group, operating from bases in southern Japan, were among the first USAF aircraft engaged in the Korean War, carrying out missions over South Korea on 27 and 28 June, before carrying out the first USAF bombing mission on North Korea on 29 June 1950, bombing an airfield near Pyongyang.On 10 August 1950, the Air Force Reserve's 452d Bombardment Wing was activated for Korean service. It flew its first missions in November 1950 from Itazuke, Japan, providing daylight support, with the 3rd Bomb Wing, consisting of the 8th, 13th, and 90th Bomb Squadrons, flying night missions. Because of the Chinese intervention, they were forced to find another base, so they moved to Miho Air Base on the west coast of Honshū. In early 1951, they moved to Pusan East Air Base, continuing their daylight and night-intruder missions. In June 1951, they joined the 3rd Bomb Wing in night activity only, dividing the target areas, with the 452nd taking the eastern half and the 3rd the western. For their efforts in the Korean War, they received two unit citations and the Korean Presidential Citation. They also received credit for eight campaign operations.
In May 1952, they were inactivated. Their aircraft and equipment along with their personnel were absorbed by the 17th Bomb Wing. During their time as an active unit, the 452nd flew 15,000 sorties with a loss of 85 crewmen.
B-26s were credited with the destruction of 38,500 vehicles, 406 locomotives, 3,700 railway trucks, and seven enemy aircraft on the ground. On 14 September 1951, Captain John S. Walmsley Jr. attacked a supply train. After all his guns simultaneously jammed, he illuminated the target with his searchlight to enable his wingmen to destroy the train. Walmsley was shot down, and posthumously awarded the Medal of Honor. Invaders carried out the last USAF bombing mission of the war 24 minutes before the armistice agreement was signed on 27 July 1953.
In addition to the standard attack versions of the B-26 for night interdiction missions, modified WB-26s and RB-26s of the 67th Tactical Reconnaissance Wing flew critical weather observation and reconnaissance missions in supporting roles.
Southeast Asia
The first B-26s to arrive in Southeast Asia deployed to Takhli [Royal Thai Air Force Base|Takhli RTAFB], Thailand in December 1960. These unmarked aircraft, operated under the auspices of the U.S. CIA, were augmented by an additional 16 aircraft— 12 B-26Bs and B-26Cs plus four RB-26Cs under Operation Millpond. Their mission was assisting the Royal Lao Government in fighting the Pathet Lao. The repercussions from the Bay of Pigs invasion meant no combat missions are known flown, although RB-26Cs operated over Laos until the end of 1961. Then, the aircraft operated in South Vietnam under Project Farm Gate. The only other deployment of B-26 aircraft to Laos prior to the introduction of the B-26K/A-26A was the deployment of two RB-26C aircraft modified for night reconnaissance during May–July 1962 under Project Black Watch. These aircraft, drawn from Farm Gate stocks, were returned at the end of these missions.The aircraft from Laos participated in the early phase of the Vietnam War with the USAF, but with Vietnamese markings as part of Project Farm Gate. Although Farm Gate operated B-26Bs, B-26Cs, and genuine RB-26Cs, many of these aircraft were operated under the designation RB-26C, although they were used in a combat capacity. During 1963, two RB-26Cs were sent to Clark AB in the Philippines for modifications, although not with night systems similar to those modified for Black Watch. The two aircraft returned from Black Watch to Farm Gate were redesignated RB-26L to distinguish them from other modified RB-26Cs, and were assigned to Project Sweet Sue. Farm Gate's B-26s operated alongside the other primary strike aircraft of the time, the T-28 Trojan, before both aircraft types were replaced by the Douglas A-1 Skyraider. The B-26s were withdrawn from service in February 1964 after two accidents related to wing-spar fatigue, one during combat in Southeast Asia in August 1963 and one during a demonstration at Eglin AFB, Florida, in February 1964.
On 11 February 1964, two pilots from the 1st Air Commando Wing stationed at Florida's Hurlburt Field died in the crash of a B-26 on Range 52 at Eglin AFB after it lost a wing during pull-out from a demonstration strafing pass. The aircraft was participating in a demonstration of the Special Air Warfare Center's counterinsurgency capabilities, and completed a strafing run demonstration before the incident. SAWC presented the demonstration on an average of twice each month for the previous two years. B-26 aircraft used by USAF Commandos in Vietnam were grounded 8 April 1964 following an investigation into the 11 February incident. B-26 aircraft in use by the South Vietnamese Air Force were also grounded in accordance with the U.S. ruling.
In response to this, the On Mark Engineering Company of Van Nuys, California, was selected by the USAF to extensively upgrade the Invader for its new counterinsurgency role. The first production flight of the B-26K was on 30 May 1964 at the Van Nuys Airport. On Mark converted 40 Invaders to the new B-26K Counter-Invader standard of upgraded engines, propellers, and brakes, remanufactured wings, and wing-tip fuel tanks for use by the 609th Special Operations Squadron. In May 1966, the B-26K was again redesignated A-26A for political reasons, and deployed in Thailand to help disrupt supplies moving along the Ho Chi Minh trail. Two of these aircraft were modified with a forward-looking infrared system under project Lonesome Tiger, as a part of Operation Shed Light.
CIA
In early 1961, about 20 B-26Bs, most converted from B-26C configuration, were "sanitized" at Duke Field, Florida. They had defensive armament removed, and were fitted with the eight-gun nose, underwing drop tanks, and rocket racks. They were flown to a CIA-run base in Guatemala, where training was under way for B-26, C-46, and C-54 Cuban exile air crews by personnel from the Alabama Air National Guard. After transfer to Nicaragua in early April 1961, they were painted in the markings of the Fuerza Aérea Revolucionaria, the air force of the Cuban government.On 15 April 1961, crewed by Cuban exiles, eight B-26s of the Fuerza Aérea de Liberación attacked three Cuban airfields to destroy FAR combat aircraft on the ground. On 17 April 1961, FAL B-26s supported the seaborne Bay of Pigs Invasion of Cuba. The conflict ended on 19 April, after the loss of nine FAL B-26s, ten Cuban exiles, and four American aircrew in combat. The FAR flew B-26Cs in the conflict, one of which was downed by friendly fire from a CIA "command ship" with the loss of four Cuban aircrew.
The CIA contracted pilots, some employed during the Bay of Pigs Invasion, to fly B-26Ks for ground attack against Simba rebels in the Congo Crisis. Newly remanufactured B-26K Counter-Invaders were delivered to the Congo via Hurlburt Field in 1964.
France
In the 1950s, the French Air Force's bombing groups including Bombardment Group I/19 Gascogne and GB 1/25 Tunisia, used B-26s, during the First Indochina War, lent to France by the USAF.Haiphong Cat Bi-based Douglas B-26 Invaders operated over Dien Bien Phu in March and April 1954 during the siege of Dien Bien Phu. In this period, a massive use of Philippines-based USAF B-29s against the Viet Minh heavy artillery, including the potential use of nuclear weapons, was planned by the U.S. Joint Chiefs of Staff with the French as Operation Vulture, but was cancelled by the governments, while at the conclusion of the battle, some of the beleaguered French troops managed to escape through the jungle to neighboring Thailand.
Indonesia
The Indonesian Air Force has expressed its interest on acquiring the B-26 Invaders in 1951, but due to the Korean War the United States was not able to provide the aircraft. By the time the Korean War ended, Indonesia faced economic trouble and cancelled the acquisition.Concerned about Indonesian President Sukarno's communist leanings, the CIA started Operation Haik in 1958 to support Permesta rebels. The covert operation committed at least a dozen B-26 Invaders in support of rebel forces. On 18 May 1958, American contract pilot Allen Pope's blacked-out B-26 was initially hit by naval anti-aircraft fire and then brought down by a North American P-51 Mustang flown by Capt. .
The capture and trial of Pope brought a quick end to Operation Haik, but the capabilities of the Invader were not lost on the Indonesian government. In 1959, the government originally wanted to obtain eight aircraft, but due to insufficient funds, only six were bought. The six aircraft were obtained from a surplus USAF aircraft auction at Davis-Monthan AFB. The Invaders were refurbished by a stateside civilian company and were ferried to Indonesia by Skyways Aircraft Servicing, Ltd in full Indonesian military markings, with all aircraft delivered in mid-1960.
These aircraft went on to a fairly long follow-up careers. The B-26s participated in the military operations against the Dutch in the West New Guinea dispute and Commonwealth forces in the Borneo confrontation. The last combat flights of two final survivors were in 1975–1977 during the Indonesian invasion of East Timor, providing support for the capture of Bobonaro, Maubisse, Baucau, Viqueque, Lospalos, and also counter-insurgency missions. In December 1977, the last aircraft was retired and flown to Yogyakarta for preservation at the Air Force Central Museum.
Portugal
The Portuguese Air Force purchased Invaders covertly for use in Portuguese Angola in 1965, during the Portuguese Colonial War.Democratic Republic of the Congo
B-26s were used in support of the Dragon operations to liberate Western hostages held by Simba terrorists during the Congo Crisis.Biafra
used two provisionally armed B-26s in combat during the Nigerian Civil War in 1967, flown, among others, by Jan Zumbach.Variants
Douglas/U.S. military variants
Many of the A-26/B-26 Invader's production run of 2,452 were early A-26Bs and A-26Cs.;XA-26
;XA-26A
;XA-26B
;TB-26B
;VB-26B
File:A-26C-56-DT 44-35982.jpg|thumb|Overall gloss black A-26C-55-DT, AF Ser. No. 44-35982, showing the Bombardier nose and improved, clear-view "clamshell" canopy. An AN/APQ-13 radome is fitted in the forward bomb-bay, and "zero-length" launchers for 5 in HVAR rockets are under the outer wings.
;RB-26C
;TB-26C
;XA-26D
;XA-26E
;XA-26F
;A-26Z
;JD-1
;YB-26K
;B-26K
;RB-26L
;B-26N
;WB-26
Third-party civil variants
Since 1945, over 300 A-26s have been on the FAA U.S. Civil Aircraft Register. Perhaps up to 100 of those were probably only registered for ferry flights from USAF bases such as Davis-Monthan AFB, AZ, and Hill AFB, UT, to civil airports and stored as candidates for sale on the civil or overseas military markets.The initial main civil uses were as "executive" personnel transports with minimal modifications such as removal of military features, bomb-bay doors sealed shut, passenger-entry stairs in bomb bay, and the conversion of the fuselage to accept six to eight passengers. Improvements developed considerably until the early 1960s, when purpose-built executive types such as the turboprop Gulfstream I became available.
During the mid-1950s, A-26s were tested and used as air tankers for suppression of forest and wildland fires, and briefly used borate-based retardants, hence the inaccurate and unofficial term "borate bombers". Borate was later discontinued due to its undesirable ecologic effects, replaced with retardant mixtures of water, clays, fertilizers, and red dyes. That use of A-26s on USDA contracts was discontinued in major regions by about 1973, after many of the A-26 air tankers found willing purchasers in Canada.
Much early development of conversions was carried out by Grand Central Aircraft, whose drawings and personnel were taken up by the On Mark Engineering Company of Van Nuys, California, from about 1955. By the 1960s, On Mark had an exclusive license from Douglas Aircraft Company for manufacture and sale of parts for A-26s. The on Mark Executive, the On Mark Marketeer, and the pressurized On Mark Marksman were products of this effort.
File:RSAF B-26 Invader.jpg|thumb|left|B-26 Invader at Royal [Saudi Air Force Museum] in Riyadh
A significant conversion was the Rock Island Monarch 26, while less numerous and more basic conversions for executive operations were carried out by Wold Engineering, LB Smith Aircraft Corp., R. G. LeTourneau Inc, Rhodes-Berry Company and Lockheed Aircraft Service Inc.
Garrett AiResearch used two A-26 variants as testbeds for turbine engines; see also XA-26F above.