Part B of the Supporting Statement

1.	Respondent Universe

	Respondents associated with this information collection are owners or
operators of existing aerospace manufacturing and rework facilities. 
The North American Industrial Classification Codes (NAICS) associated
with this industry include the following:

336411 - Aircraft Manufacturing

336412 - Aircraft Engine and Engine Parts Manufacturing

336413 - Other Aircraft Parts and Auxiliary Equipment Manufacturing

336414 - Guided Missile and Space Vehicle Manufacturing

336415 - Guided Missile and Space Vehicle Propulsion Units and
Propulsion Units Parts Manufacturing

336419 - Other Guided Missile and Space Vehicle Parts and Auxiliary
Equipment Manufacturing

481111 - Scheduled Passenger Air Transportation

481112 - Scheduled Freight Air Transportation

481211 - Nonscheduled Chartered Passenger Air Transportation

481212 - Nonscheduled Chartered Freight Air Transportation

481219 - Other Nonscheduled Air Transportation

	The respondent universe was estimated to consist of approximately 1,000
aerospace manufacturing and rework facilities.  Several databases were
used to identify aerospace manufacturing and rework facilities.  These
databases include OECA’s ECHO and OTIS databases, the NEI database,
and the TRI database.  Each database was searched by NAICS or Standard
Industrial Classification (SIC) codes to identify aerospace facilities. 
The resulting list of facilities was examined for duplicates and known
closed facilities.  Input from the industry was also obtained.

	All of the survey recipients, regardless of actual or potential HAP
emissions, will be required to complete some portion of the electronic
survey.  Facilities that are major sources of HAP emissions, facilities
that have taken enforceable permit limits to restrict HAP emissions to
below major source thresholds, and facilities with the potential to emit
HAP emissions below major source thresholds will all be required to
complete the applicable sections of the survey.  Thus, the government
burden estimates in Table 7 are based on 1,000 survey responses.

2.	Response Rates

	Since the information will be requested pursuant to the authority of
CAA section 114, EPA expects that all respondents requested to submit
information will do so.     

