AC NO: 21-4 B DATE: 7/30/69
FEDERAL AVIATION ADVISORY
TMINISTRATOT CIRCULAR
DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION SUBJECT: SPECIAL FLIGHT PERMITS FOR OPERATION OF OVERWEIGHI AIRCRAFT PURPOSE. This circular provides information and guidance with respect to application for, and issuance of special flight permits to operate an aircraft in excess of its maximum certificated takeoff weight, for flight beyond the normal range over water, or over land areas where adequate landing facilities or appropriate fuel is not available.
CANCELLATION. AC No. 21-4A, effective 9/16/66, is cancelled.
3. REFERENCE.
a. Federal Aviation Regulations (FAR) Part 21, Sections 21.197 (b) and
21.199.
b. International Flight Information Manual. (This Federal Aviation Administration manual is for sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D. C. 20402;
4. GENERAL. FAR 21.197(b) limits the excess weight that may be authorized for overweight operations to additional fuel, fuel carrying facilities, and navigational equipment necessary for the flight. Guidance and information specifically applicable to the applicant's proposed flight may be obtained from any Federal Aviation Administration District or Area Office. The following paragraphs provide general intormation which should be helpful to the applicant.
a. Application for a special flight permit is made on FAA Form 8130-6 "Application for Airworthiness Certificate." (A sample form is in Appendix 1). FAR 21.199 establishes the general application requirements.
Initiated by: FS-180
Page 2 AC 21~4B 7/30/69
b. FAR Part 43 prescribes requirements for approval, return to service, and alteration records associated with the installation of additional facilities. Appendix B of FAR Part 43 and Advisory Circular 43.9-1B give instructions for completion of the FAA Form 337, on which alterations are recorded.
c. It is recommended that the applicant discuss the proposed flight with the manufacturer of the aircraft or an FAA-approved repair station, to determine the availability of technical data on the installation of additional fuel carrying facilities and/or navigational equipment.
Before flight to a foreign country of an aircraft having a special flight permit authorizing overweight operation, the applicant should determine whether operating requirements may be imposed by that country, and any other country on the route of flight, because of the condition of the aircraft. (See Section D on the reverse side of the Special Airworthiness Certificate, FAA Form 8130-7.) A request for permission to operate over or within a foreign country should include a statement describing the deviations from the FAA airworthiness standards. (Such deviations, in effect, would also be deviations from the airworthiness standards of Annex 8 to the Convention on International Civil Aviation (ICAO), since the FAA standards meet ICAO requirements.) With respect to an aircraft operating under FAR 21.197 (b), the statement may be worded as follows: This aircraft does not comply with the International Airworthiness Standards of Annex 8 to the Convention on International Civil Aviation when operated at a weight in excess of its maximum certificated takeoff weight because of the additional fuel, fuel carrying facilities, and navigation equipment installed in the aircraft. (Note: The words "and navigation equipment" should not be used if such additional equipment is not required for the flight.)
e. If the aircraft is being exported, the applicant must comply with any applicable requirements established by the Departments of State, Treasury, and Commerce, and, if an FAA Export Certificate of Airworthiness is required, with the applicable regulations in FAR Part 21, Subpart L. The FAA International Flight Information Manual also provides guidance with respect to the requirements for navigation and operation of aircraft in foreign countries, as well as other miscellaneous information of value to persons contemplating flights outside of the United States.
CRITERIA USED TO DETERMINE THE SAFETY OF ADDITIONAL FACILITIES. In approving the installation of additional facilities, the FAA must find that the altered aircraft is safe for operation. To assist in arriving at such a determination, the following questions are normally considered:
Par. 4
AC 21-4B Page 3 7/30/69 Does the technical data include installation drawings, structural substantiating reports, weight, balance, new center of gravity limits computations, and aircraft performance limitations in sufficient detail to allow a conformity inspection of the aircraft to be made?
b. In what ways does the aircraft not comply with the applicable airworthiness requirements (See FAR 21.199(a) (4))?
c. Are the fuel tanks vented to the outside? Are all areas in which tanks are located ventilated to reduce fire, explosion, and toxicity hazards?
d. Are the tanks even when empty strong enough to withstand the differential pressure at maximum operating altitude for a pressurized aircraft?
e. Have means been provided for determining the fuel quantity in each tank prior to flight?
f. Are shutoff valves, accessible to the pilot, provided for each additional tank to disconnect these tanks from the main fuel system?
g. Are the additional fuel tank filler connections designed to prevent spillage within the aircraft during servicing?
h. Is the engine oil supply and cooling adequate for the extended weight and range?
LIMITATIONS. The following types of limitations may be necessary for safe operation of the aircraft (Reference FAR 21.199(a) (6)):
a. Revised operational airspeeds for use in the overweight condition.
b. Increased pilot skill requirements.
c. A prescribed sequence for using fuel fron various tanks as necessary to keep the aircraft within its center of gravity range.
d. Notification to the control tower of the overweight takeoff condition to permit use of a runway to minimize flight over congested areas.
e. Avoidance of severe turbulence. If encountered, the aircraft should be inspected for damage as soon as possible.
Par. 5
Page 4 AC 21-4B 7/30/69
f. Notification to the nearest District or Area Office located at the point of departure from the U.S. in sufficient time for that office to determine that the aircraft still conforms to the terms and conditions of the special flight permit.
outing Flight Standards Service Director Par. 6
AC 21-4B Appendix 1 7/30/69 Page 1 Example of an Application for a Special Flight Permit for Operation in Excess of Maximum Certificated Takeoff Weight (Face Side) Form Approvec Budget Bureau No. 04-R003:
INSTRUCTIONS-Print or tipe Do nor write in shaded areas, these FEDERAL AVIATION ADMINISTRATION DEPARTMENT OF TRANSPORTATION Reper rative addition sore in tequire use an each tent. additional space is required, use an atrachment.
AFPUCATION FOR AIRWORTHINESS CERTIFICATE For special fligh: permits complere Sections Il and VI or VI! as applicable.
PEOTTRATION MABE MAME (mate) AIRCEAFT MODEL DESIGNATION 4. TR MPG. | FAA CODING IS AIRCRAFT SERIAL NO & ENGINE BUILDER S AME (mutr) 7. ENGINE MODEL DE NUMBER OF ENGINES PROPELLER BUILDI E'S NAME (mate) 10. PROPELLER MODEL DESIGNATION 11. AIRCRAFT I5
I NEW I USED IMPORT APPLICATION IS HERESY MADE FOR: A 41 HER T INSOMAL UTATY ACROBATIC TRANSPORT) GIDER L BALDON
X SPECIAL ALEWCATHINESS CERTIFICATE / CAR ADDIE HERET
LIMITED REDUESTED PROVISIONAL / 11 CLASS 1 CLASS I!
•GRICULTURE & PEST CONTRO AERIAL SURVEYING. 3 NEVEATSING RESTRICTED // FATROLLING ¡WEATHER CONTRO!
CERTIFIC ATIONE OTHER (SperS)
RESEARCH AND DEVELOPMENT AMATEUR BUILT EXHIBITION INTAL / Indiate eperation/ i) RACINO j5 | INKT SURVET
TO SHOW COMPLIANCE WITH PAR FERRY FLIGHT FOR REPAIRS. ALTERATIONS, MAINTENANCE OR STORAGE SPECIAL FLIGHT PERMITTICIN so he condoled lien compinte EVACUATE FROM AREA OF IMPENDING DANGER 11 or 711 to -pplicable on 3 X OPERATION IN EXCESS OF MAX CERTIFICATED TAXE-CFF WEIGHT I DEUVEFING OR EXPORT 5; IFRODUCTION FUGHT TESTING MELT PLE A STORTINESS CERTIFICATE arrie Restrief Operation and Standard or Limited di colidote soare) A REGISTERCO OWNER /11 SNA IF DEALER, CHECK HERE
NAME ADDRESS CAST CENT CATION BASIS HE Male bot and OR a waNd) CERTIFICATION ARCART SFSCFCATON CR TAPE CERF-CATION DATA SHEET /GIA VO AIRMOATINESS DIRECTIES / 1/ Cable AD I
AIRCRAFT LISTING CY A
AIRCRAFT OPERATION AND MAINTENANCE RECORDS CHECK IF RECORDS IN TOTAL AIRFRAME HOURS-Enter /ur Mied Arraft only JEXFERIMENTAL ONLY -Enier hONTS AS certificate resued
COHPLIANCE WITH D. CERTIFICATION-! herch, certify tha: 1 am the owner (or his agent of the arcraft described above, that the aircraft is nogistered with th the Federal Aviation Act of 1958. and applicable Federal Avation Regula orchiness certicate requested
DATE OF APPACACICN SIGNATURE AS BEEN INSPECTED AND FOUND AIRWORTHY BY 1R 21.18) (d) -pplusy FAR PART 121 OR 127 CERTIFICATE HOLDER /GIZ CERTIFICATED MECHANIC / OHY CERTIFICATED REPAIR STATION / GILe CAFEICHIe 2 Cord.an - No 1
SIGNATURE m lor Vil and find it meets the requraments for:
IX jB. SPECIAL AVCRTHINESS CERTIFICATE
TIC OF ITS CURPENT AIRWORTHINESS CERTIFICATE
ANCES SIGNATURE AND NO PAA INSPECTOR'S SIGNATURE Richard C. Smit 7/10/69 CE -GADO-1/ Richard C. Smith FAA Form 6130-6
Appendix 1 AC 21-4B Page 2 7/30/69 Example of an Application for a Special Flight Permit for Operation in Excess of Maximum Certificated Takeoff Weight (Reverse Side) A. MANUFACTURER
NAME ADDRESS PRODUCTION FLICHT TESTING | PRODUCTION CERTIFICATE / GOLPREM DE
TYPE CERTIFICATE ONLY
APFROVED PRODUCTION INSPECTION SYSTEM C. GIVE QUANTITY OF CERTIFICATES REQUIRED FOR OPERATING NEEDS:
DATE OF APPLICATION I SIGNATURE A. DESCEIPTION OF AIRCRAFT REGISTESED OWNER *DoREss 1492 North Street John J. Doe St. Louis, Missouri 12345 MODEL Beech DSOA
SERIAL NUMBER ESIS PATION MARK 4321 N1 234Z B. DESCEPTION OF PLIGMT ON FLIGKT TEST St. Louis, Missouri Honolulu, Hawaii
DEPARTUPE DATE DURATION Oakland, California July 15, 1969 15 days
CHEN REDUCED TO OPERATE THE APPART AND ITS EQUIPMENT
• X PLOT X/comer "
D THE AIRCRAFT DOES NOT MEET THE APPLICABLE AIRNCCTHINESS RECUR NIS AS FOLLOWS The aircraft does not meet the applicable airworthiness requirements when operated VII. SPECIAL FLIGHT PERMIT PURPOSES OTHER THAN at a weight in excess of its certificated weight of 6300 1bs. The temporary fuel tank installation is in accordance with Flight Inc., Drawing 2-26189 and FAA Form 337 "Major Repair and Alteration" dated June 15, 1969, issued by CE-GADO-17.
• THE FOLLOWING RESTRICTIONS APE CONS DEED NE When the aircrait is overweight, the cruising speed (Vc) should not exceed 185 m.p.h. and the maximum speed (ine) should not exceed 205 m.p.h.
The sequence of use for the auxiliar; fuel tanks, as shown by a temporary placard on the instrument pacei, should be aft, forward, center.
The fuel quantity should mot xceed 106 ga lons in the forward tank, 164 gallons in the center and 45 gallons in the aft tank.
CERTIFICATION- L ath the Federal An Admistan wardare July 2, 1969 John Doe A. Operating 1 r. 13..ors cna M:
91 31 ce Applicable & Curent Openin C. Dato, Drawint, Protocruci D. Currant weighi
AC 21-4B Appendix 1 7/30/69 Page 3 Example of a Special Airworthiness Certificate Issued to Permit Operation in Excess of Maximum Certificated Takeoff Weight
UNITED STATES OF AMERICA
DEPARTMENT OF TRANSPORTATION - FEDERAL AVIATION ADMINISTRATION
SPECIAL AIRWORTHINESS CERTIFICATE A CLASSIFICATION: Special Flight Permit: PURPOSE: Operation in excess of maxa certificated I.O. weight MANU. NAME AYA FACTURER ADDRESS >N/A FROM St. Louis, Missouri
C FLIGHT IN-12342 TO Hogolulu. Hawaii SERIAL NO. 4321 BUILDER Beech MODEL D5O A DATE OF ISSUANCE 7/18/69 EXETRY 7/30/69 OPERATING LIMITATIONS DATED 7/10/69 ARE A PART OF THIS CERTIFICATE
DESIGNATION OR OFFICE NO Vichar Richard C. Smith CE -GADO-17 imprisonment not ceeding 3 years, or both or misuse of this certifcate THIS CERTIFICATE MUST BE DISPLAYED IN THE AIR DISPLAYED IN $1.000 or
CRAFT IN ACCORDANCE WITH APPLICABLE FEDERAL AVIATION REGULATIONS FAA FORM B130-7 13-691 SUPERSEDES FAA FORMS 62-B: 8100-3 8130-5 SEE REVERSE SIDE (Face Side) A This airworthiness certificate is issued under the authority of the Federal Aviation Act of 1958 and the Federal Aviation Regulations (FAR) This airworthiness certificate authorizes the manufacturer named on the reverse side to conduct production flight tests, and only production flight tests, of aircraft registered in his name. No person may conduct production fight tests under this certificate: (1) Carrying pergons or property for compensation or hire: and or (2) Carrying persons not essential to the purpose of the flight.
This airworthiness certificate authorizes the flight specified on the reverse side for the purpoge shown in Block A This airworthiness certificate certifies that, as of the date of issuance, the aircraft to which issued has been inspected and found to meet the requirements of the applicable FAR. The aircraft does not meet the requirements of the applicable comprehensive and detailed airworthiness code as provided by Annex 8 to the Convention On International Civil Aviation. No person may operate the aircraft described on the reverse side: (1) except in accordance with the applicable FAR and in accordance with conditions and imitations which may be prescribed by the Administrator as part of this certificate; (2) over any foreign country without the special permission of that country.
Unless sooner surrendered, suspended, or revoked, this airworthiness certificate is effective for the duration and under the conditions prescribed in FAR Part 21, Section 21.181 or
21.217.
(Reverse Side)
Appendix 1 AC 21-4B Page 4 7/30/69 Example of Operating Limitations Which May be Prescribed as Part of the Special Airworthiness Certificate Shown on Page 3 of this Appendix Aircraft Make: Beech Model: D50A Serial No: 4321 _ Ident. Marks: N1234Z Issue Date: 7/10/69
OPERATING LIMITATIONS
1. Maximum weight must not exceed 8,150 pounds.
2. Maximum quantity of fuel carried in auxiliary tanks must not exceed 106 gallons in fwd tank, 164 gallons in center tank, and 45 gallons in aft tank.
3 _ Center of gravity limits must not exceed (fwd) +116.8 and (aft) +124.6.
4. Acrobatics are prohibited.
5. Use of autopilot while in overweight condition is prohibited.
6. Weather conditions with moderate to severe turbulence should be avoided.
7. When an overweight landing is made or the aircraft has been flown through moderate or severe turbulence while in an overweight condition, the aircraft must be inspected for damage after landing.
The inspections performed and the findings must be entered in the aircraft log. The pilot must determine, before the next takeoff, that the aircraft is airworthy.
When operated in the overweight condition, the cruising speed (Vc) shall not exceed 185 m.p.h. and the maximum speed (Vue) shall not exceed 205 m.p.h.
9. Operation in the overweight condition must be conducted to avoid areas having heavy air traffic, to avoid cities, towns, villages, and congested areas, or any other areas where such ilights might create hazardous exposure to person or property on the ground.
10. Prior to requesting clearance to takeoff position, the pilot in command must advise the tower of the overweight condition and of any limitations with respect to a specific runway or prescribed meteorological conditions.
The pilot-in-command shall contact the Oakland General Aviation District Office (WE-GADO-7), 9636 Earhart Road, P. O. Box 2397, Alrport Station, Oakland, California 94614, telephone (415) 569-8879, prior to arrival at Oakland, in sufficient time for review of the ferry permit and FAA inspection of the aircraft before departure for Honolulu.