STC SA972NW

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA972NW This certificate issued to: Tri-City Airways, INC.

Part 3 of the CiviI Air Regulations:

Original Product - Type Tortificate Number: 3A25 Make: Cessna Model: 320F (Norma1/Restricted) Description of Type Design Change: Installation of sensor booms and associated systems in accordance with Tri-City Airways, Inc. photographs 1 through 7.

NOTE: This change includes a modification of the access window to accommodate the installation of the sampling probes. The installation also reduces Vne (never exceed speed) to 210 mph (CAS) from 257 mph (CAS) and limits the seating capacity to 3 due to the removal of the access (escape) window during RESTRICTED CATEGORY operations.

Limitations and Conditions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Cessna 320F, Serial Number 320F0018 only. A copy of this Certificate, Addendum No. SA972NW, and FAA Approved Airplane Flight Manual Supplement shall be maintained as part of the permanent records for the modified aircraft.

Date of Application: June 30, 1980 Date Reissued:

Date of Issuance: . July 2, 1980 Date Amended:

FEDERAL AVIATION Chartest Lehrede TAMINISTRANIOS Chief, Engineering and Manufacturing Branch (Title)

47.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) July 2, 1980 Number: SA972NW Supplemental Type Certificate ADDENDUM NO. SA972NW The conditions and limitations of the original specification apply except as follows:

This Addendum, which is part of Supplemental Type Certificate No. SA972NW, prescribes the conditions and limitations under which the product for which the STC was issued and meets the airworthiness requirements of Civil Air Regulations 3. A copy of this Addendum shall be maintained as part of the Supplemental Type Certificate HOLDER: Tri-City Airways, Inc.

I. CESSNA 320F (NORMAL/RESTRICTED CATEGORY) AS MODIFIED BY STC SA972NW Same as basic configuration except reduction of the never exceed speed and the limitation of the seating capacity to a total of 3 people.

Airspeed Limitations (CAS):

Never Exceed Speed (Vne) - 210 mph (CAS) Airspeed Indicator Instrument Markings (CAS):

Never Exceed (glide or dive, smooth air) - 210 mph (red line) Required Placard:

The following placard must be displayed in full view of the pilot:

CESSNA 320F, N320FW

NORMAL/RESTRICTED CATEGORY Vc - 210 mph (CAS) Vne - 210 mph (CAS) AIRCRAFT LIMITED TO 3 PLACE NOTE 1: This aircraft has been issued a multiple certificate of airworthiness permitting operation in the Standard and Restricted categories under the provisions of FAR 91.39 (with exception, see NOTE 2) and FAR

21.187(a). The aircraft may be converted from one category to another upon an inspection by an FAA inspector or by a certified mechanic to determine airworthiness. A logbook entry must be made by the persons performing the conversion.

(OVER)

FAA FORM 8110-2-1 (10-69) PAGE 3 OF4 PAGES C FAA AC 73-2651

July 2, 1980 STC ADDENDUM NO. SA972NW NOTE 2: SPECIAL PURPOSE RESTRICTED CATEGORY OPERATIONS This approval applies to aircraft certified for the use of an air sampling probe; these limitations apply:

1. No persons other than the minimum crew required shall be carried.

2. This aircraft shall not be operated in any manner which will endanger public life and property, while over densely populated areas and near busy airports.

NOTE 3: STANDARD (NORMAL CATEGORY) OPERATIONS Prior to the carriage of passengers, the aircraft must be converted to the Standard classification of airworthiness and inspected by an FAA inspector or certified mechanic.

2. The operating limitations in the form of placards or listings shown in the aircraft specifications apply for the Standard Category.

- END - Page 4 of 4 Pages