AD 71-20-02

71-20-02 HAWKER SIDDELEY: Amdt. 39-1295. Applies to Model DH-114 "Heron" airplanes.

Compliance is required as indicated.

To ensure that the emergency escape hatches (P/N's 14 FS.2991A, 4 FS.835A/1, or 4 FS.835A/2) can be opened from outside the airplane accomplish the following:

(a) Before further flight check the operation of each escape hatch lock mechanism by turning the external handle with the internal handle in the stowed position. The check required by this paragraph may be performed by the pilot.

(b) If an escape hatch lock mechanism is found to be inoperable during the check required by paragraph (a), before further flight, except that the airplane may be flown in accordance with FAR 21.197 to a base where the repairs can be performed, secure the inoperable lock mechanism to the escape hatch in accordance with Hawker Siddeley Aviation, Ltd., Technical News Sheet Series: Heron (114) No. F.16, Issue 1, dated March 15, 1971, or an FAA- approved equivalent.(c) Within the next 100 hours' time in service after the effective date of this AD, unless already accomplished, secure the lock mechanism to each escape hatch in accordance with Hawker Siddeley Aviation, Ltd., Technical news Sheet Series: Heron (114) No. F.16, Issue 1, dated March 15, 1971, or an FAA-approved equivalent.

This amendment becomes effective September 23, 1971.