The programme was led by the Direction Générale Technique and one of its requirements was for all metal construction to withstand the hot and humid climates of French African colonies.

[1] It had a high wing of trapezoidal plan, built in three parts: a short central section which joined the fuselage and two outer panels occupying the great majority of the span.

The forward part included the engine mountings and the enclosed cabin just ahead of the wing, seating the pilots side-by-side with dual controls.

The trapezoidal fixed surfaces were built around pairs of spars and skinned with corrugated dural, with a cantilever tailplane mounted on top of the fuselage.

Instead of trim tabs, the LH.70 had a pair of trapezoidal winglets, mounted on the lower longerons about 2.2 m (7 ft 3 in) ahead of the elevator hinge and projecting about 850 mm (33.5 in) out of the fuselage.

Its 5.7 m (18 ft 8 in) track was determined by the separation of the outer engines, as each vertical, shock absorbing oleo strut was fixed to the second wing spar within the nacelle.