NOTES ON POP'S VERSION OF FAA CIRCULAR 36-3G

The rows corresponding to the planes being proposed for use by the start-up airlines are color coded with this orange color.  We have only selected those versions of the planes which comply with the County's airport noise ordinance, which is maximum limit of 78 dBA during the day, and 75 dBA during the night (planes operated by the government, police, fire department, or life-rescue companies are exempted from the County's Airport Noise ordinance.)

The row corresponding to Mr. West's Lear-23 Jet is color coded with this dark gray color.  Mr. West's jet has regularly violated the County's noise ordinance. He has been asked to obtain a hush kit for it.

The life-rescue planes, which include those planes which transport organs for transplants, fly Lear-23's and other Lear planes, the latter of which are identified in our table by this lighter gray color.

BUCHANAN DAYTIME NOISE LIMIT (7AM-10PM) -- 78dBA -- is shown by this color-coded row.

BUCHANAN NIGHTTIME NOISE LIMIT (10PM-7AM) -- 75dBA --  is shown by this color-coded row.

There are many air-carrier planes that can meet the County's noise ordinance, but cannot use Buchanan because they are too heavy.  These planes are color coded by this light orange color.  As an example, all versions of the Boeing 757 meet our noise ordinance, and are rated as being more quiet than the planes proposed by the start-up airlines, but all the 757's weigh more than 250,000 llbs, more than 2.5 times the weight of the BAe-146.  There are also other version of the BAe-146 that the start-ups can use.  These planes are also color coded by this light orange color.  In this regard, the AVRO 146- RJ planes are the improved second generation of the BAe-146's, and are about 4 dBA more quiet.  AVRO International Aerospace is (was?) a subsidiary of British Aerospace (BAe).

If the Weight of such planes is over Buchanan's limit of 90,000 llbs, their weight number is coded with this red color.

If the Weight of such planes is under Buchanan's limit of 90,000 llbs, their weight number is coded with this green color.

Hush kits which are indicated directly on the rows (rather than with numbers in the NOTES column) are indicated in our table by bold italics type.  We have only don this for planes under 78 dBA.

The rows corresponding to common corporate jet aircraft which use Buchanan are highlighted with this yellow color.

The rows corresponding to the new quiet Regional Jets (RJ's).  These are 30-70 person jets that started appearing on the market in the mid 1990's.  Since this Circular was released in 1996, it only lists the RJ's from Bomberdier (e.g., the Canidair).  Embraer has recently rolled out its versions of the RJ's, which are not listed in the Circular.  Given the new RJ planes cost substantially more than the BAe-146 and the DC-9 (12-25 million versus 3-10 million) and carry half as many passengers, there is a question of whether they will be economically viable given the proximity of Buchanan to nearby lost-cost airports (Oakland, Sacramento).

The FAA's Reference Notes on its noise figures. (These are the numbers that appear in the last column)

* Less than maximum flap setting.

1. Engines equipped with P-36 acoustical treatment.

2. Quiet nacelles and double wall fan duct treatment.

3. Double wall fan duct treatment.

4. Retain from AC 36-3A.

5. Estimated using non-certification measurement data.

6. Nacelle with fixed lip inlet.

7. Increased takeoff thrust rating.

8. Thrust cutback used.

9. ICAO Annex 16 certification data source.

10. DOT/FAA noise measurements.

11. Propeller noise estimation model.

12. Certification spectra analyzed to obtain dBA.

13. Estimated using certification data from aircraft with similar engines.

14. Estimated using the Integrated Noise Model (INM).

15. Based on manufacturer's data.

16. Equipped with hushkit.

17. Equipped with Learavia engine suppressor nozzle and ECR 936.

18. Equipped with Learavia engine suppressor nozzle.

19. DGAC noise measurements.

20. Equipped with thrust reversers.

21. Estimated using 14 CFR part 36, Appendix G certification data.

22. Airbrake open on approach.

23. Equipped with Noise Reduction Inlet.

24. Fed Ex lightweight hushkit.

25. Fed Ex heavyweight hushkit.

26. Data for TFE-731-3R-1H also applies to TFE-731-3-1H.

27. Equipped with modification M3530.

28. Equipped with Boeing inlet.

29. Equipped with Burbank Aeronautical Corporation inlet.

30. AvAero lightweight hushkit.

31. AvAero heavyweight hushkit.

32. AvAero heavyweight hushkit with lightweight hushkit nozzle.

33. Equipped with STAR3 STC ST00258SE.

34. Equipped with STAR3 STC ST00259SE.

35. Engines equipped with 48 fan outlet guide vanes.

36. Engines equipped with 70 fan outlet guide vanes.