CLA-2-84:RR:NC:MM:106 C88226
Mr. Paul L. Robert
Pratt & Whitney
400 Main Street
East Hartford, CT 06108
RE: The tariff classification of jet aircraft engine airseals.
Dear Mr. Robert:
In your letter dated April 20, 1998 you requested a tariff
classification ruling. You included drawings and literature with
your request.
The items in question are part number 50H021, a High-Pressure Compressor (HPC) Airseal; part number 54H846, a Diffuser
Airseal; part number 50L195, a High-Pressure Turbine (HPT)
Airseal; part number 50L659, a High-Pressure Turbine (HPT)
Airseal; part number 50N412, a Low-Pressure Turbine (LPT)
Airseal; and part number 50N007, a Low-Pressure Turbine (LPT)
Airseal. All of these parts are components of commercial jet
aircraft engines.
Part number 50H021 is an airseal used in the high-pressure
compressor (HPC) of the PW4000 aircraft gas turbine engine. The
airseal consists of a round metal titanium flange, varying in
diameter from 54 to 56 inches, depending on the engine model.
The purpose of the airseal is to block the passage of air being
drawn into the engine so that air is directed into the HPC rather
than passing through cracks or seams in the HPC module's piece
parts and subassemblies, thus preventing a potential thrust loss
and reduced efficiency for the engine.
Part number 54H846 is an airseal used in the diffuser
assembly of the PW4000 engine. Located at the rear of the HPC,
the titanium airseal fits over the rotating shaft and ensures
that compressed air does not leak around the shaft or the
titanium case housing the HPC. This airseal serves the same
purpose as part number 50H021.
Part numbers 50L195 and 50L659 are High-Pressure Turbine
(HPT) Airseals for the PW4000 aircraft gas turbine engine. The
HPT consists of multiple titanium hubs and airfoils that accept
compressed, superheated air from the combustion sections of the
engine and further compress and accelerate the air to cause
thrust. The purpose of the titanium airseals are to minimize air
leakage or loss and to ensure that compressed air remains in the
gas path and is not lost between the rotating HPT module and its
titanium case.
Part numbers 50N412 and 50N007 are Low-Pressure Turbine
(LPT) Airseals used in the PW4000 engine series. These titanium
airseals serve the same purpose as the part numbers mentioned
above, ensuring no loss of compression in the LPT assembly within
the engine.
The applicable subheading for the jet aircraft engine
airseals will be 8411.91.1060, Harmonized Tariff Schedule of the
United States (HTS), which provides for parts of aircraft
turbines for use in civil aircraft.
This ruling is being issued under the provisions of Part 177
of the Customs Regulations (19 C.F.R. 177).
A copy of the ruling or the control number indicated above
should be provided with the entry documents filed at the time
this merchandise is imported. If you have any questions
regarding the ruling, contact National Import Specialist
Patrick J. Wholey at 212-466-5668.
Sincerely,
Robert B. Swierupski
Director,
National Commodity
Specialist Division