USNBD, Bombs and Fuzes; Section I - High Explosvie Bombs; Part III - U.S. Army-Navy "AN" Series Bombs: 2000 lb. AN-M34, AN-M66

U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS

SECTION I - HIGH EXPLOSIVE BOMBS

PART IV - U.S. ARMY-NAVY "AN" SERIES BOMBS

DATA:		U.S. ARMY - NAVY BOMBS
		2000 LB. G.P.
OVERALL LENGTH	90.4 in.
BODY LENGTH	70.0 in.
BODY DIAMETER	23.3 in.
WALL THICKNESS	0.5 in.	AN-M34 (Obsolescent)
TAIL LENGTH	25.7 in.	AN-M66 (Service)
TAIL WIDTH	31.6 in.	AN-M66A1 (Service)
TAIL WEIGHT	38.6 in.	AN-M66A2 (Service)

WEIGHTS:

	AN-M34		AN-M66		AN-M66A1
Type of Filling	Amatol	T.N.T.	Amatol	T.N.T.	T.N.T.	Comp. B
Weight of Filling	1063#	1117#	1063#	1117#	558#	1142#
Total Weight	2049#	2103#	2052#	2106#	2106#	2140#
Chg/Wt. Ratio	51.9%	53.1%	52.0%	53.0%	53.0%	53.0%

FUZING:

The fuzing of these bombs is the same with the exceptions: The AN-Mk230 (with Mods) and Mk240-0 fuzes can be used in the AN-M66 because the bomb has the M115 (or M115A1, see Indroduction) adapter booster. The M115 adapter booster has a sleeve that can be easily removed making it possible to use a fuze with a lar-ger diameter. With the removable sleeve screwed in the adapter booster any Army tail fuze may be used. The AN-M34 uses the M102 adapter booster which has an removable sleeve and a diameter too small to receive the AN-Mk230 (with Mods) and Mk240-0 hydrostatic fuzes.

Regular Missions

Nose:	AN-M103, AN-M103A1, M103, M135, M135A1, M136, M136A1, M139, AN-M139A1, M140, AN-M140A1, M149, M163, M164, M165, Mk243, Mk244, Mk239
Tail:	AN-M102A2, AN-M102A1, M102, M162

Special Missions

Tail:	M114, M114A1 (Masthead bombing from land based planes only) M117 (Masthead bombing from carrier or land beses) M125, M125A1, M134, Mk238-0 (Long Delay Time fuze against land tar-gets)
Nose:	Shipping plug, when above tail fuzes are used.

Anti-Submarine Missions (AN-M66, AN-M66A1, AN-M66A2)

Nose:	AN-M103A1, AM-M103, M103, M139, AN-M139A1, M140, AN-M140A1, M163, M164, M165, Mk239, Mk243, Mk244-0-1
Tail:	AN-Mk 230-4-5-6, AN-Mk 240-0 (Sleeve in M115 adapter booster must be removed before this fuze can be used.)

VT Missions

Nose:	T50E1, T89, T91, M166 (T51E1), T82
Tail:	AN-M102A2 (To detonate bomb in event of VT fuze failure.)

REMARKS:

The AN-M34, AN-M66, and AN-M66A1 differ in the adpater booster which is em-ployed in the base plate to receive the tail fuze. The AN-M34 uses the M102 adap-ter booster, the AN-M66 uses the M115 adapter booster, and the AN-M66A1 uses the M115A1 adapter booster. The A1 modification also includes two base plate locking pins fitting into the main filling, preventing removal of the base plate, and a groove in the internal threads of the base plate which mates with the hole of the M115A1 adapter booster to receive a locking pin, supplied only with anti-withdrawal fuzes. With this pin held in place by the fuze body, the adapter booster cannot be extracted.

A heavier nose section distinguishes the AN-M66A2 from the AN-M66A1.

B-29 attacks on Japan have shown that aerodynamic forces at high altitudes of bombing (over 25,000 ft.) are causing the tail assemblies of G.P. bombs to deform, thus inducing erratic bomb flight and side impact. Until standard heavier gauge fins are available, rein-forcing fin kit consisting of angles, brackets, and plates are being issued to strengthen tail assemblies.

For Construction of Body, Suspension, Color & Markings, Type of Filling, and Tail Construction, see Introduction, page 37.