From FAA Advisory Circular no. 25-7C "Flight Test Guide For Certification Of Transport Category Airplanes":
17. Climb: One-Engine-Inoperative - § 25.121.
a.(...).
b. Procedures.
(1)(a) (...) These climbs are flown with the wings nominally level. (...)
(2) If full rudder with wings level cannot maintain constant heading, small bank angles of up to 2 to 3 degrees into the operating engine(s), with full rudder, should be used to maintain constant heading. (...).
From the paper linked in #46:
According to the accident investigation report, the airplane lost speed progressively, stalled and crashed, (...)
Without consulting the accident report, it would seem that the accident was probably due to failure to maintain correct pitch attitude and airspeed rather than loss of lateral control, use of rudder or bank angle.