Dimensions and Areas
Last updated
Last updated
This section gives the user the principal dimensions of the BELL 505, the reference lines, the zones and areas necessary to identify where the maintenance task is done. Also included are all the access and drainage provisions necessary. The principal dimensions include metric conversions.
The principal dimensions are shown in a general configuration drawing of the helicopter on skid landing gear. All height dimensions must be considered approximate due to variations in loading and landing gear deflection.
The principal dimensions include metric conversions.
The principal exterior dimensions are shown in a three views general configuration drawing
The principal interior dimensions are shown in the two side views of the helicopter.
Reference lines show the user the coordinates on the general configuration drawings of the helicopter from a predetermined origin to assist in locating equipment, assemblies, access doors, and panels. The following reference lines are shown:
Fuselage Station (FS) lines are vertical reference lines, as viewed from the side of the helicopter. They show the distance from the datum line (FS 0.0) to a reference line. FS lines located aft of the datum line are expressed as positive values and FS lines located forward of the datum line are expressed as negative values.
Buttock Lines (BL) are vertical reference lines, as viewed from the front of the helicopter. They are parallel to the helicopter centerline when viewed from the top. They show the distance from the helicopter centerline (BL 0.0) to a reference line. BL located left of the helicopter centerline are expressed as negative values and BL located right of the helicopter centerline are expressed as positive values.
Waterlines (WL) are horizontal reference lines, as viewed from the side or the front of the helicopter. They show the distance above or below the datum line (WL 0.0) to a reference line. WL located above the datum line are expressed as positive values and WL located below the datum line are expressed as negative values.
Boom Station (BS) lines are reference lines perpendicular to the tailboom centerline when viewed from the side. They show the distance from the tailboom origin (BS 0.0) to a reference line. BS lines are all located aft of the tailboom origin and are all positive values.
The origin is a point located forward of the helicopter nose cone, slightly below the ground level and along the centerline. It is at the intersection of the FS datum line (FS 0.0), the helicopter centerline (BL 0.0), and the WL datum line (WL 0.0).
The zones and areas are defined to facilitate maintenance by clearly identifying where on the helicopter the maintenance is to be done.
To aid in the performance of the maintenance, the helicopter is divided into major zones delimited by Fuselage Stations (FS), Buttock Lines (BL), and Waterlines (WL), unless specified otherwise. These are divided into smaller zones.
The zones are identified with a three-digit number as follows:
100
Fuselage
From FS 37.8 to FS 235.5, from WL 26.0 to WL 85.7, and from BL -30.0 to BL 30.0, excluding the cockpit (200) and the area above the baggage compartment (400).
200
Cockpit
From the canted bulkhead to FS 109.8, between the roof (WL 85.70) and the floor (WL 33.5), and between BL -30.0 to BL 30.0.
300
Aft section
From the tailboom attachment (FS 235.5) to FS 452.2.
400
Power train and drive train
From FS 103.0 above the roof, above the tailboom to FS 413, including the main rotor hub and blades, the area above the baggage compartment, and the tail rotor gearbox, hub and blades.
700
Landing gear
The left and right skid tubes, the forward and aft crosstubes, and to include the steps and the maintenance step.
110
Nose compartment
From FS 37.8 to the canted bulkhead.
120
Flight controls compartment
From the canted bulkhead to the frames at FS 109.8, and between the belly (WL 26.0) and the floor (WL 33.5).
121
Forward-left flight controls compartment
From the canted bulkhead to the left eyebrow frame support, outboard of the left canted keel beam, and between the belly (WL 26.0) and the floor (WL 33.5).
122
Forward-right flight controls compartment
From the canted bulkhead to the right eyebrow frame support, outboard of the right canted keel beam, and between the belly (WL 26.0) and the floor (WL 33.5).
123
Mid-left flight controls compartment
From the left eyebrow frame support to the left quarter frame at FS 97.8, outboard of the left canted keel beam, and between the belly (WL 26.0) and the floor (WL 33.5).
124
Mid-right flight controls compartment
From the right eyebrow frame support to the right quarter frame at FS 97.8, outboard of the right canted keel beam, and between the belly (WL 26.0) and the floor (WL 33.5).
125
Aft-left flight controls compartment
From the left quarter frame at FS 97.8 to the left quarter frame at FS 109.8, outboard of the left keel beam (BL -12.1), and between the belly (WL 26.0) and the floor (WL 33.5).
126
Aft-right flight controls compartment
From the right quarter frame at FS 97.8 to the right quarter frame at FS 109.8, outboard of the right keel beam (BL 12.1), and between the belly (WL 26.0) and the floor (WL 33.5).
127
Forward-center flight controls compartment
From the canted bulkhead to the eyebrow frame support (FS 79.5), between the left and right canted keel beams, and between the belly (WL 26.0) and the floor (WL 33.5).
128
Mid-center flight controls compartment
From the eyebrow frame support (FS 79.5) to the frame at FS 97.8, between the left and right canted keel beams, and between the belly (WL 26.0) and the floor (WL 33.5).
129
Aft-center flight controls compartment
From the frame at FS 97.8 to the frame at FS 109.8, between the left keel beam (BL -12.05) and the right keel beam (BL 12.05), and between the belly (WL 26.0) and the floor (WL 33.5).
130
Cabin belly compartment
From the frames at FS 109.8 to the frames at FS 147.7, and between the belly (WL 26.0) and the floor (WL 33.5).
131
Forward-left cabin belly compartment
From the left quarter frame at FS 109.8 to the left quarter frame at FS 128.4, outboard of the left keel beam (BL -12.1), and between the belly (WL 26.0) and the floor (WL 33.5).
132
Forward-right cabin belly compartment
From the right quarter frame at FS 109.8 to the right quarter frame at FS 128.3, outboard of the right keel beam (BL 12.1), and between the belly (WL 26.0) and the floor (WL 33.5).
133
Aft-left cabin belly compartment
From the left quarter frame at FS 128.4 to the left quarter frame at FS 147.7, outboard of the left keel beam (BL -12.1), and between the belly (WL 26.0) and the floor (WL 33.5).
134
Aft-right cabin belly compartment
From the right quarter frame at FS 128.4 to the right quarter frame at FS 147.7, outboard of the right keel beam (BL 12.1), and between the belly (WL 26.0) and the floor (WL 33.5).
135
Forward-center cabin belly compartment
From the frame at FS 109.8 to the frame at FS 128.4, between the left keel beam (BL -12.1) and the right keel beam (BL 12.1), and between the belly (WL 26.0) and the floor (WL 33.5).
136
Aft-center cabin belly compartment
From the frame at FS 128.4 to the frame at FS 147.7, between the left keel beam (BL -12.1) and the right keel beam (BL 12.1), and between the belly (WL 26.0) and the floor (WL 33.5).
140
Cabin
From FS 109.8 to the passenger bulkhead (FS 147.7), between the roof (WL 85.7) and the floor (WL 33.5).
150
Aft belly compartments
From the frames at FS 147.7 to the quarter frames at FS 181.0, outboard of the left keel beam (BL -12.1) and right keel beam (BL 12.1), and below the left and right lower fuel webs (WL 33.5).
151
Forward-left aft belly compartment
From the left quarter frame at FS 147.5 to the left quarter frame at FS 155.0, outboard of the left keel beam (BL -12.1), and below the left lower fuel web (WL 33.5).
152
Forward-right aft belly compartment
From the right quarter frame at FS 147.5 to the right quarter frame at FS 155.0, outboard of the right keel beam (BL 12.1), and below the right lower fuel web (WL 33.5).
153
Aft-left aft belly compartment
From the left quarter frame at FS 155.0 to the left quarter frame at FS 181.0, outboard of the left keel beam (BL -12.1), and below the left lower fuel web (WL 33.5).
154
Aft-right aft belly compartment
From the right quarter frame at FS 155.0 to the right quarter frame at FS 181.0, outboard of the right keel beam (BL 12.1), and below the right lower fuel web.
160
Control tunnel
From the passenger bulkhead (FS 147.5) to the tunnel bulkhead (FS 155.0), between the left tunnel vertical beam (BL -12.1) and the right tunnel vertical beam (BL 12.1), and between the belly (WL 26.0) and WL 63.8.
170
Fuel compartments
From the passenger bulkhead (FS 147.5) to the aft fuel bulkhead (FS 181.0) below the baggage floor (WL 46.0), excluding the control tunnel (between BL -12.05 and BL 12.05, FS 147.5 and FS 155.4, and WL 26.0 and WL 46.0), and above the left and right lower fuel webs (WL 33.5) outboard of the left keel beam (BL -12.1) and right keel beam (BL 12.1), including the expansion space outboard and left of the control tunnel (BL -12.1), above WL 46.0 and below WL 64.6, between the passenger bulkhead (FS 147.5) and FS 155.4.
171
Fuel cell compartment
From the passenger bulkhead (FS 147.5) to the aft fuel bulkhead (FS 181.0) below the baggage floor (WL 46.0), excluding the control tunnel (between BL -12.05 and BL 12.05, FS 147.5 and FS 155.4, and WL 26.0 and WL 46.0), and above the left and right lower fuel webs (WL 33.5) outboard of the left keel beam (BL -12.1) and right keel beam (BL 12.1).
172
Fuel filler compartment
Outboard and left of the control tunnel (BL -12.1), above WL 46.0 and below WL 64.6, between the passenger bulkhead (FS 147.5) and FS 155.4.
180
Baggage compartment
From the tunnel bulkhead (FS 155.3) to the aft bulkhead (FS 181.0), and between the upper shear web at WL 44.7 and the upper baggage panel (WL 65.0).
190
Aft fuselage
From the aft bulkhead (FS 181.0) to the tailboom attachment (FS 235.5), below the lower firewall (WL 76.3), and outboard of the left firewall (BL -14.2) and right firewall (BL 14.2).
191
Left aft fuselage
From the aft bulkhead (FS 181.0) to the tailboom attachment (FS 235.5), on the left side of the truss assembly and outboard of the left firewall (BL -14.2).
192
Right aft fuselage
From the aft bulkhead (FS 181.0) to the tailboom attachment (FS 235.5), on the right side of the truss assembly and outboard of the right firewall (BL 14.2).
193
Center aft fuselage, truss assembly
From the aft bulkhead (FS 181.0) to the tailboom attachment (FS 235.0), below the lower firewall (WL 76.3).
210
Left side of the cockpit
From the canted bulkhead to FS 109.8, on the left side of the center line (BL 0.0) to BL -30.0.
220
Right side of the cockpit
From the canted bulkhead to FS 109.8, on the right side of the center line (BL 0.0) to BL 30.0.
230
Instrument panel and pedestal
310
Tailboom
From the tailboom attachment at FS 235.0 to the aft face of the tail rotor gearbox support at FS 423.0.
320
Horizontal stabilizer
330
Vertical stabilizer
410
Main rotor blades
420
Main rotor hub
430
Main rotor drive compartments
From FS 103.0 to the forward firewall (FS 181.0), above the roof (WL 85.7) and from the passenger bulkhead (FS 147.9) to FS 181.0, above the upper baggage panel (WL 64.6).
431
Forward main rotor drive compartment
From FS 103.0 to FS 147.5, above the roof (WL 85.7).
432
Upper main rotor drive compartment
From FS 147.5 to the forward firewall (FS 181.0), above the roof (WL 85.7), to the top of the transmission fairings (WL 106.2), and to include the swashplate assembly.
433
Lower main rotor drive compartment
From the passenger bulkhead (FS 147.9) to FS 181.0, between the upper baggage panel (WL 65.0) and WL 84.8, to include the transmission and mast assembly and the pitch link assemblies.
440
Power plant
From the forward firewall (FS 181.0) to FS 251.9, above the lower firewall (WL 76.2).
441
Accessory gearbox section
From the forward firewall (FS 181.0) to the forward intake firewall (FS 198.2), above the horizontal firewall (WL 76.3), to include the drip pan of the horizontal firewall below WL 76.3.
442
Intake section
From the forward intake firewall (FS 198.1) to the aft intake firewall (FS 205.3) above the lower intake firewall (WL 82.1).
443
Turbine section
From the aft intake firewalls (FS 205.3) to the aft firewall (FS 223.2), above the lower firewall (WL 76.3), and to include the area between the lower intake (WL 82.1) and the horizontal firewall (WL 76.3) from the forward intake firewall (FS 198.1) to the aft intake firewall (FS 205.3).
444
Exhaust section
From the aft firewall (FS 223.2) to FS 253.9, and above the truss assembly (WL 76.3).
450
Tail rotor drive
From FS 253.9 to FS 422.9, above the tailboom, and to include the tail rotor gearbox.
460
Tail rotor hub
470
Tail rotor blades
FS 127
710
Forward crosstube
FS 125.9, to include the maintenance step.
720
Aft crosstube
FS 183, to Include the maintenance step.
730
Left skid tube
BL -35, to include the step.
740
Right skid tube
BL -35, to include the step.
The access provisions show all the access panels and doors on the helicopter. They are identified according to the zones where they are located. The drainage provisions are also shown.
The access panels and doors are identified with the three digits of the zone where they are located. The zone identifier is followed by two suffix letters. The first letter is the primary identifier that uniquely identifies the panel or door and starts with the letter A in each zone. The second letter identifies its location as follows:
T
Top
B
Bottom
L
Left
R
Right
Z
Internal
The access panels and doors are listed in the following table.
110AB
Nose cone, access to components of the environmental control system, and to taxi and landing lights
120AB
Forward belly panel, access to components of the flight controls
125AZ
Left cockpit floor, access to components of the flight controls
126AZ
Right cockpit floor, access to the Air Data/Attitude and Heading Reference System (ADAHRS)
129AZ
Center cockpit floor, access to components of the flight controls
130AZ
Cabin floor, access to components of the flight controls
140AL
Clamshell door, access to cabin
153AL
Left mid-belly access-panel, access to structure under the left side of the fuel compartment
154AR
Right mid-belly access-panel, access to structure under the right side of the fuel compartment and to the transponder antenna
160AB
Control-tunnel access panel, access to components of the flight controls
172AL
Fuel filler access-door, access to fuel filler and drain ports
180AL
Mid-left mid-fuselage panel, access to baggage compartment, components of the fuel system (expansion plate, forward vent, etc.)
180BR
Baggage compartment door, access to baggage compartment
180CZ
Baggage compartment floor, access to components of the fuel system (fuel cell, aft vent, fuel level sensor, etc.)
180DZ
Baggage compartment panel, access to portion of fuel cell
191AL
Left aft-fuselage panel, access to truss assembly, avionics shelf, etc.
192AR
Right aft-fuselage panel, access to truss assembly, avionics shelf, etc.
192BR
Electrical compartment access-door, access to battery, CB panel
192CR
External power access-door, access to external power receptacle
210AL
Left crew door, access to cockpit and cabin
220AR
Right crew door, access to cockpit and cabin
310AB
Forward tailboom access-panel, access to magnetometer and antennae of the radar altimeter kit
310BB
Aft tailboom access-panel, access to tailboom internal structure and directional control cables
310CB
Tail-rotor gearbox and empennage support cover, access to tail rotor gearbox attachments and components of the flight controls
432AL
Left transmission fairing, access to the upper main rotor drive compartment, gearbox, flight controls, left LIVE mount, and hydraulic system
432BR
Right transmission fairing, access to the upper main rotor drive compartment, gearbox, flight controls, right LIVE mount, and hydraulic system
432CZ
Main driveshaft access-panel, access to the main driveshaft
433AL
Upper-left mid-fuselage access-panel, access to the lower main rotor drive compartment, fuel prime pump, left LIVE mount, hydraulic pump, main gearbox restraint, and main driveshaft
433BR
Upper-right mid-fuselage access-panel, access to the lower main rotor drive compartment, engine controls, right LIVE mount, hydraulic pump, main gearbox restraint, and main driveshaft
441AT
Forward engine cowling, access to forward engine bay
441BR
Forward engine access panel, access to forward engine bay
443AT
Aft engine cowling, access to aft engine bay
443BR
Aft engine access panel, access to aft engine bay
443CL
Engine wash access panel, access to engine wash fitting when the engine wash kit is installed
444AT
Exhaust fairing, access to exhaust, oil cooler blower, components of the tail rotor drive
450AT
Forward driveshaft cover, access to components of the tail rotor drive
450BT
Mid driveshaft cover, access to components of the tail rotor drive
450CT
Aft driveshaft cover, access to components of the tail rotor drive
The drainage provisions are shown in the following image.
The first digit corresponds to the major zones. Refer to the list of the .
The second and third digit identify the smaller zones within the major zones. Refer to the list of the .
Refer to for the location of the zones on the general configuration drawings of the helicopter.
