Bell Helicopter I I *: I ;J

A Subsidiary of Textron, inc.

February 28, 2000

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INFORMATION LETTER 206E-00-81
206L-00-87
407-00-48
204-00-7
205-00-20
212-00-32

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412-00-38

TO: All Owners/Operators of Bell 2068, 206L, 206L-1, 407, 204, 205,
212, and 412 Helicopters.

SUBJECT: INSPECTION OF AIRBORNE CARTRIDGE/CANISTER FUEL

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BOOST PUMPS FOR PRESENCE OF CHECK VALVE
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Bell Helicopter has been made aware of field reports which indicate the potential
for the check valves, PIN E6-34-1, to be removed from fuel pumps manufactured
by Parker Aerospace Airborne division. The valves may not be installed as a
result of mistaking them for shipping plugs, handling damage during installation,
or damage while performing maintenance in and around the fuel tank.

An incident involving rapid expansion of the fuel cell on another manufacturer's

aircraft was noted as not having the subject check valves installed, but this
observation was determined not to be a major contributor. The incident aircraft
was also found as having improperly installed support clamps and a locally
fabricated fuel line, which was implicated in the ignition source.

Parker Aerospace has issued Product Reference Memo number 50 (attached),

detailing instructions for inspection of the presence of the subject check valve.

Bell Helicopter recommends compliance with the Parker Aerospace inspection at

the next scheduled maintenance interval.
Product Reference Memo Number: 50
Date: 1121100
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Subject: Inspection of Airborne Cartridge/Canister Fuel Boost Pumps to ensure the presence

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of check valves (PIN E6-34-1).

AppIicabiI : Airborne Fuel Boost Pumps with the following part numbers: 1036-1, 1C364,
1038-1, 1038-4, 1039-4, 1C42-1, 1C64-1, 1064-2, 1064-5, 1064-6, 1064-7,
1064-8, 1064-9, 1064-12, 1C64-13, 1064-15, 1064-16, 2037-1, 2037-2,
2037-3, 2037-4, 2037-5 and 2037-6. A list of fuel pump versus airframe

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application is provided in Table 1.

Background:
Field reports indicate the potential for the check valves (PIN E6-34-1) to be removed from the

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above fuel pumps either as a result of mistaking them for shipping plugs, handling damage
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during installation or damage while performing maintenance in and around the fuel tank.
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These check valves aid the pump in venting fue! from the pump's motor and impeller cavities
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but, more importantly, are also essential in ensuring that fuel does not leak from the pump
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once the cartridge is removed. Note that the operating performance of the pump is not
to
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affected by the absence of these check valves.

Recommendation:
At the next scheduled aircraft maintenance inspection, inspect the fuel pumps listed above for
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the presence of check valves (PIN E6-34-1) per the following procedure:
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1) Remove the fuel boost pump from the airframe per the instructions outlined in the
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appropriatemaintenance/service manual provided by the airframe manufacturer.

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2) Inspect the fuel pump to ensure the presence of a check valve on each motor cavity
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and impeller cavity. These check valves are orange in color and are shaped in the
form of an umbrella (Reference Figure 1).
3) If a check valve is missing at either location on the pump, procure one from an
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authorized Airborne distributor and install it in accordance with the instructions provided
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on the attached Airborne "Cartridge/Canister Fuel Boost Pump Service Instruction"

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sheet.
4) Due to the level of disassembly required, the motor cavity check valves on the 2037-3,
2037-4 and 2037-6 fuel pumps cannot be replaced in the field. Contact Airborne's
Customer Support Team via telephone at (440) 284-6215 to coordinate the return of
these pumps directly to Airborne in order to have these check valves replaced.

(Page 1 of 3)
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Aerospace
Parker Hannifin Corporation Airborne Division
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711 Taylor Street Elyria, Ohio 44035 284-6300 Fax: 440 322.5625
Technical Service Hotline: 1-800-382.8422 E-mail: techhelp@parker.com www.parker.com/airborne
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Airborne
Air a Fuel Products

Product Reference Memo Number: 50 (Continued)

5) Install and then verify proper operation of serviceable fuel boost pump per instructions
outlined in the appropriate maintenance/service manual provided by the airframe
manufacturer.

UMBRELLA CHECK VALVE-

CAVITY
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BLEED HOLE

UMBRELLA CHECK VALVE-

IMPELLER CAVITY

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\___ FILLISTER HEAD SCREVJ-

LOCK WASHER
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Cartridge/Canister Fuel Boost Pump (Typical)

FIGURE 1

(Page 2 of 3)

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Aerospace
Airborne
Air & Fuel Products

Product Reference Memo Number: 50 (Continued)

Fuel Pump PIN Airframe Manufacturer Airframe Model

1C36-1 Bell 206L, 206L1
1C36-4 ( Bell 407
1C38.1 L
Bell 206B
1C381 I Agusta , AB206B
1C38-4 I McDonnell Douglas MD-900
1039-4 Bell . 427
1 C42.1 ( Fokker F27, F227
1C64-1 Bell 204, 205, 212, 412
1064-1 I Agusta , AB204, AB205, AB212. AB412
1064-1 Bell UH-1, AK-1
1064-2 Eurocopter MBB BO-105
1064-5 Raytheon 19000, 1900D
1 C64-6 Kaman Sea Sprite
1064-7 Eurocopter I BO-105, BK-117
1064-8 E Eurocopter Super Puma
}

1064-9 Kaman K-1200

1064-12 Raytheon Premier I
1064-13 Raytheon Horizon
1064-15 Eurocopter Super Puma
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1 C64-16 Bell 1 Agusta ( AB139

2037-1 {
Embraer j EMB-110
2037-2 CASA C-212
2037-3 British Aerospace Jetstream 4100
2037-4 British Aerospace Super Jetstream 31
2C37-5 Harbin ( Y-12
2C37-6 British Aerospace Super Jetstream 31

Fuel Pump versus Airframe Application

TABLE 1

(Page 3 of 3)
Aerospace
 Technical
Airborne
Air & Fuel Products
Service
Instruction
CARTRIDGE/CANISTER FUEL BOOST PUMPS
Service Instruction

Motor Cavity Check Valve Inspection

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Caution: Do not attempt to install the motor cavity

orange "umbrella" check valve without first
removing the canister assembly. uPer+EUA o+E{7c VALVE
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1. Canister Assembly Removal
Remove two fluster head screws and lock washers
CANISTER
holding the canister flange to the pump housing. (Screw
security has been doubly assured by the application of
Loctite 290 during original manufacture.) Remove
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canister flange and canister o-ring.

2. Canister Assembly Cleaning and Inspection

UMBRELLA VALVE-
Remove any loose accumulation of foreign material from / cAvrTY
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disassembled parts by washing in cleaning solvent and
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drying with clean, dry compressed air. Examine the

canister for nicks, dents or scratches. Pay particular
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attention to the seal faces of the flange of the canister

and the seal face of the check valve. Replace any
defective part. Dents in the canister may result in
unsatisfactory installation of the pump cartridge and/or
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induce canister leakage during cartridge installation.

Replace screws if damaged during removal.
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3. Canister Reassembly
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Install a new, lubricated o-nng in the machined groove

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of the pump housing. Lubricate the bulb on the stem of

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the new check valve and gently pull it through the center
hole in the top of the canister, being careful not to
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overstretch or tear the stem. When properly installed,

the umbrella portion of the check valve should lay flat
Boost Pump (TyD call
against the outside surface of the canister covenng the
bleed holes. Clip the installation stem oft leaving only FIGURE t
the retaining bulb (Refer to Figure 2). Install canister,
spacer washers, canister flange (chamfer side down),
lock washers and screws. Apply Loctite 290 to the
threads of the screws prior to tightening. Torque screws
to 12-13 in-lb.

Aerospace
Parker Hannifin Corporation Airborne Division
711 Taylor Street Elyria, Ohio 44035.440 284-6300 Fax: 440 322-5625
E-mail: techhelp@parker.com www.parker.cornlairbome
Impeller Cavity Check Valve Inspection
Caution: Do not attempt to install the impeller cavity
orange "umbrella" check valve without first
removing the adapter plug.
1. Adapter Plug Removal
The adapter plug is retained in the pump housing utilizing
a press fit and Loctite 601. It may be removed by
carefully prying between the shoulder of the adapter and
the pump housing with a suitable tool, taking care not to
damage either part.
2. Adapter PluglPump Housing Cleaning and Inspection
Visually inspect the adapter plug for nicks, scratches or
distortion that may have been incurred during removal
or handling. Check to see that the vapor bleed hole(s)
is/are free of foreign material. Remove any residual
Loctite and wash with cleaning solvent. Dry with clean,
dry compressed air. Replace damaged adapter plug with
new part. Visually inspect pump housing counterbore
for any damage that might prevent acceptable
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reassembly of the adapter plug. Remove any residual

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Loctite and wash with cleaning solvent. Check for

assurance of press fit of adapter plug. Blow out the drilled
and cored vapor passages with compressed air to ensure CLIPPING TOOL
all foreign material has been removed. Dry with clean, Figure 2
dry compressed air.
3. Impeller Cavity Check Valve Installation
Lubncate the bulb in the stem of a new check valve and
gently pull it through the center hole in the adapter plug,
being careful not to overstretch or tear the stem. When
properly installed, the umbrella portion of the check valve .0801.075
should lay flat in the bottom of the cup of the adapter
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plug. Apply a thin coating of Loctite 601 to the skirt of

the adapter plug and press it into the counterbore of the
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pump housing. Alignment of the adapter plug skirt and

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counterbore must be maintained during reassembly.

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Misalignment will damage both the adapter plug and the

counterbore.

CLIPPING TOOL (Enlarged)

Figure 3

Technical Service Hotline:

1-800-382-8422
ffarkrAerospace
Parker Hannifin Corporation Airborne Division
711 Taylor Street Elyria, Ohio 44035.440 284.6300 Fax: 440 322.5625
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E-mail: techhelp@parker.com www.parker.com/airbome

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