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GSAC
98-04-24 RAYTHEON AIRCRAFT COMPANY (FORMERLY Beech Aircraft Corporation): Amendment 39-10336; Docket
No. 97-CE-58-AD.
Applicability: Models E55, E55A, 58, 58A, 58P, 58PA, 58TC, and 58TCA Airplanes and 60, 65-B80, 65-B90, 90, F90, 100,
300, and B300 series airplanes (all serial numbers), certificated in any category.
NOTE 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of
whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes
that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected,
the owner/operator must request approval for an alternative method of compliance in accordance with
paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or
repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the
request should include specific proposed actions to address it.
Compliance: Required as indicated, unless already accomplished.
To minimize the potential hazards associated with operating the airplane in severe icing conditions by
providing more clearly defined procedures and limitations associated with such conditions, accomplish the
following:
(a) Within 30 days after the effective date of this AD, accomplish the requirements of paragraphs (a)(1) and
(a)(2) of this AD.
NOTE 2: Operators should initiate action to notify and ensure that flight crewmembers are apprised of this
change.
(1) Revise the FAA-approved Airplane Flight Manual (AFM) by incorporating the following into the Limitations
Section of the AFM. This may be accomplished by inserting a copy of this AD in the AFM.
Severe icing may result from environmental conditions outside of those for which the airplane is certificated. Flight
in freezing rain, freezing drizzle, or mixed icing conditions (supercooled liquid water and ice crystals) may result in
ice build-up on protected surfaces exceeding the capability of the ice protection system, or may result in ice
forming aft of the protected surfaces. This ice may not be shed using the ice protection systems, and may seriously
degrade the performance and controllability of the airplane.
During flight, severe icing conditions that exceed those for which the airplane is certificated shall be determined by
the following visual cues. If one or more of these visual cues exists, immediately request priority handling from Air
Traffic Control to facilitate a route or an altitude change to exit the icing conditions.
- Unusually extensive ice accumulation on the airframe and windshield in areas not normally observed to collect
ice.
- Accumulation of ice on the upper surface of the wing, aft of the protected area.
- Accumulation of ice on the engine nacelles and propeller spinners farther aft than normally observed.
Since the autopilot, when installed and operating, may mask tactile cues that indicate adverse changes in
handling characteristics, use of the autopilot is prohibited when any of the visual cues specified above exist, or
when unusual lateral trim requirements or autopilot trim warnings are encountered while the airplane is in icing
conditions.
All wing icing inspection lights must be operative prior to flight into known or forecast icing conditions at night.
[NOTE: This supersedes any relief provided by the Master Minimum Equipment List (MMEL).]"
approved AFM by incorporating the following into the Normal Procedures Section of the AFM. This may be
accomplished by inserting a copy of this AD in the AFM.
MANUEL DE VOL BEECHCRAFT 'BARON 58' 1973 -
CONSIGNE DE NAVIGABILITE
RAYTHEON AIRCRAFT COMPANY
AIRWORTHINESS DIRECTIVE
SMALL AICRAFT & ROTORCRAFT
réf : 98-134-IMP(AB)R1
BW 98-05
WARNING
F-GKSS
page 1
(2) Revise the FAA-
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