Bell Alert Service Bulletin 505-18-10
Date Issued: 27 July 2018
Revision: A, 9 May 2022
Model Affected
505
Subject
JET B AND JP-4 FUELS FLIGHT MANUAL LIMITATION, CHANGE OF
Helicopters Affected
Serial numbers 65011 through 65134.
[Serial number 65135 and subsequent will have the intent of this bulletin accomplished prior to delivery.]
Compliance
Within 30 days upon receipt of this bulletin.
Description
Following engineering analysis to add additional approved fuel types to the Model 505 type certificate, a discrepancy in an original report was noted. The re-evaluation of the subject findings demonstrated that for wide cut fuels such as Jet B and JP-4, the present altitude limitations published was set at too high of an altitude.
This Alert Service Bulletin (ASB) introduces a change to the Rotorcraft Flight Manual (RFM) Section 1, Figure 1-6. This change to the limitations section is introduced in conjunction with the release of BHT-505-FM-1 Rev.3.
Revision A of this bulletin is to supersede this ASB to the ASB 505-22-28 that mandates the insertion of Figure 1-6 introduced at Revision 5 of the BHT-505-FM-1 Rotorcraft Flight Manual (RFM). The Revision 5 of the RFM introduced more stringent limitations to Figure 1-6 for starting at certain altitudes, ambient temperatures, and fuel specifications.
Approval
The engineering design aspects of this bulletin are Transport Canada Civil Aviation (TCCA) approved.
Contact Information
For any questions regarding this bulletin, please contact:
Bell Product Support Engineering - Light Helicopters
Tel: 450-437-2862 / 1-800-363-8023 / pselight@bellflight.com
Manpower
Approximately 0.5 man-hours are required to complete this bulletin. This estimate is based on hands-on time and may vary with personnel and facilities available.
Warranty
There is no warranty credit applicable for parts or labor associated with this bulletin.
Material Required
The following material is required for the accomplishment of this bulletin and may be obtained through your Bell Supply Center.
| Part Number | Nomenclature | Qty (Note) |
|---|---|---|
| BHT-505-FM-1 Rev.3 | 505 Rotorcraft Flight Manual Revision 3 | 1 |
Special Tools
None required.
Weight and Balance
Not affected.
Electrical Load Data
Not affected.
References
- BHT-505-FM-1 Rotorcraft Flight Manual Rev. 3
Publications Affected
- BHT-505-FM-1 Rotorcraft Flight Manual Rev. 2
Accomplishment Instructions
- Insert BHT-505-FM-1 Rev.3 into the BHT-505-FM-1 Rotorcraft Flight Manual.
- Make sure to communicate the content of the revised fuel table for wide cut fuels such as Jet B and JP-4 to the model 505 pilots.
a. In the interim to receiving the revised fuel table content, a sample copy of the revised Figure 1-6 has been included for your familiarization.
This diagram illustrates the maximum altitude flight limits based on outside air temperature for various fuel types in the Bell 505 helicopter. The chart displays Pressure Altitude (ft and m) on the y-axis and Outside Air Temperature (°F and °C) on the x-axis. Different colored regions indicate the allowable fuel types and operating conditions:
- Green Region: Labeled "JET A, A-1, JP-5 OR JP-8", this region covers a wide range of temperatures and altitudes. A note indicates that "Jet A, A-1, JP-5, and JP-8 can be used at OAT between -40 °C (-40 °F) and -30 °C (-22 °F) provided that the fuel kinematic viscosity is 12 cSt or below. For JP-5 only, minimum OAT for starting is -30 °C (-22 °F)."
- Light Blue Region: Labeled "JET B, JP-4", this region is for lower altitudes and temperatures.
- Purple Region: Labeled "JET A, A-1, B, JP-4, JP-5 OR JP-8", this region is for a broader range of conditions than the light blue region.
- Orange Region: Labeled "JET A, A-1, JP-5 OR JP-8 ONLY", this region is for higher altitudes and temperatures.
- Maximum OAT Flight Limit Line: A distinct line separates regions, indicating the maximum allowable outside air temperature for flight.
- Specific Temperature/Altitude Points: Markers indicate specific conditions, such as "-30 °C (-22 °F)" and "22 °C (72 °F)" related to fuel usage and starting limits.
- Make an entry in the helicopter logbook and historical service records indicating compliance with this Alert Service Bulletin.
ASB 505-18-10-RA
Page 1 of 3
Approved for public release.
ASB 505-18-10-RA
Page 2 of 3
Approved for public release.
ASB 505-18-10-RA
Page 3 of 3
Approved for public release.
