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Gentex HGU-84/P Operation And Maintenance Instructions Download Page 42

3-21

Fig ure 3-20. Dual Vi sor As sem bly

VISOR HOUSING

TRACKS

SCREWS (TWO
EACH SIDE)

OUTER VISOR

INNER VISOR

OUTER VISOR
LOCK ASSEMBLY

SPACER

NOTE:

 In the ex ploded view

above, the vi sor lock is shown on 
the left side (as worn).  The lock
is nor mally in stalled on the right
side as shown in this in set.

Summary of Contents for HGU-84/P

Page 1: ...OPERATION AND MAINTENANCE INSTRUCTIONS WITH ILLUSTRATED PARTS LIST HGU 84 P COMMERCIAL HELMET ASSEMBLY GENTEX CORPORATION CARBONDALE PA JUNE 2001 2001 GENTEX Corporation...

Page 2: ...E VISOR ASSEMBLY 1 4 1 3 7 DUAL VISOR ASSEMBLY WITH QUICK DISCONNECT 1 4 1 3 8 LIGHTWEIGHT VISORS 1 4 CHAPTER 2 PREPARATION FOR USE 2 1 SIZING 2 1 2 2 HELMET FITTING 2 2 2 3 FITTING OF TPL ASSEMBLY 2...

Page 3: ...lacement of Boom Swivel Assembly 3 14 3 4 2 9 Replacement of Optional Bayonet Receiver Assembly 3 16 3 4 2 10 Replacement of Energy Absorbing Liner 3 18 3 4 2 11 Replacement of Dual Visor Assembly 3 2...

Page 4: ...k if required 1 2 SCOPE This manual contains a description of the HGU 84 P Commercial Helmet Assembly as well as the sizing fitting and maintenance instructions required to outfit aircrew members succ...

Page 5: ...hold an oxygen mask 1 3 3 THERMOPLASTIC LINER TPL ASSEMBLY Figure 1 3 The TPL assembly used in conjunction with the energy absorbing liner installed in the helmet shell assembly pro vides helmet stab...

Page 6: ...ug comfortable fit with maximum helmet stability Clamp assemblies on the nape straps allow adjustment of the nape area without added strain on the chin strap The nylon webbing nape straps feature a le...

Page 7: ...sing has a quick disconnect for ANVIS night vision goggles Before you can use the quick disconnect you must attach the ANVIS modification kit to the ANVIS mount This procedure begins on Page 2 13 1 3...

Page 8: ...ded only as general guidance Because of the wide variation in head shapes likely to be encountered it is not possible to present detailed guidance The helmet is designed to provide lightweight head pr...

Page 9: ...oward the rear and down onto the head Ensure that the edgeroll is positioned just out of the aircrew member s line of sight as the aircrew member looks upward 3 Check earcup position ensuring that the...

Page 10: ...he right side as worn and fasten the snap 8 Have the aircrew member fasten the chinstrap as follows Figure 2 4 a Feed the end of the chinstrap through the D rings on the left side of the helmet as wor...

Page 11: ...ired position by releasing the knob Single visor assembly Rotate the visor lock counterclockwise until the visor can be moved Raise or lower the visor by sliding the lock up or down Secure the visor i...

Page 12: ...8 mm left and right from the center and approximately 1 4 inch 6 3 mm from the bottom edges 2 Ensure the TPL cover assembly is secured to the TPL preformed layer assembly with two approxi mately 1 x 2...

Page 13: ...o plastic layers Having fewer than two layers will reduce helmet stability which could obstruct vision and reduce bump protection b Remove layers from the TPL assembly one at a time beginning with the...

Page 14: ...timing device for 10 minutes NOTE Heating characteristics of ovens vary This should be taken into account during the TPL heating process The time stated above is for reference only and is not a rule e...

Page 15: ...tered in the earcup assemblies and eye offset is correct See Step 5 Maintain this pressure for 5 minutes i Release downward pressure at the end of 5 minutes and check helmet fit If required steps a th...

Page 16: ...operly fitted helmet 2 Insert each oxygen mask bayonet into a jaw receiver to the third locking position The projections on the jaw receiver should be positioned toward the tip of the bayonet 3 Referr...

Page 17: ...Remove the earcup assembly on one side Referring to Figure 2 10 pull back the earcup pile fastener fabric inside the helmet shell on the same side Using a 25 drill bit drill the marked hole locations...

Page 18: ...at the jaw receiver projections point to the rear of the helmet 8 Tighten all screws so that the jaw receivers and spacers are firmly attached to the helmet 9 Cement the earcup pile fastener fabric to...

Page 19: ...igure 2 12 install the clear or neutral visor by stretching the end of the strap slightly past the helmet snap and fastening the visor snap to the helmet snap from front to back Repeat for the other s...

Page 20: ...es are aligned and the plate is flush with the top and bottom of the rear of the mount Ensure that the wires extending from the rear of the mount are aligned in the slots in the mount to prevent crush...

Page 21: ...or the housing 7 Attach pressure sensitive pile fastener to the center rear of the helmet for the ANVIS battery pack as shown in Figure 2 15 8 To remove the mount from the helmet depress the release t...

Page 22: ...nspection is a visual inspection performed by the aircrew member before after each flight The aircrew member will check the general overall condition of the helmet assembly Refer to paragraph 3 2 2 NO...

Page 23: ...ks 4 Inspect edgeroll for rips tears splits or loosening from helmet shell 5 Inspect communication cables and cordsets for cut split or abraded insulation 6 Inspect earcups for proper installation in...

Page 24: ...Mild abrasive scouring powder may be used to remove stains or scuff marks b Wipe helmet shell assembly clean using a water dampened cloth to remove detergents 2 Chin Nape Strap Assembly and Fitting Pa...

Page 25: ...ith a soft lint free cloth dampened with a 70 percent isopropyl alcohol solution or equal 3 4 SERVICING THE HELMET 3 4 1 INSPECTION UPON RECEIPT Once the basic helmet shell assembly and components are...

Page 26: ...cup Assembly 3 4 2 2 3 Replacement of Earphone Holder 3 4 2 3 4 Replacement of Earseal 3 4 2 4 5 Replacement of Chin Nape Strap Assembly 3 4 2 5 6 Replacement of Chin Strap and Chinpad 3 4 2 6 7 Repla...

Page 27: ...valent 1 Remove TPL from helmet shell assembly 2 Separate TPL cover assembly from layer assembly 3 Discard defective assembly 4 Remove any double sided tape from serviceable component 5 Referring to F...

Page 28: ...ve the earseal by carefully stretching it away from the lip of the earcup shell 3 Remove the earphone holder from the earcup shell and the earphone from the earphone holder 4 Referring to Figure 3 3 l...

Page 29: ...o the helmet shell Smooth the earphone holder inside the earcup to eliminate bunching 11 Reinstall the earseal by carefully stretching it over the lip of the earcup shell 12 Reattach the earcup assemb...

Page 30: ...older 4 Replace the earphone holder 5 Insert the earphone into the replacement earphone holder 6 With the slot opening positioned toward the earcup grommet insert the earphone holder with the enclosed...

Page 31: ...erring to Figure 3 8 remove the earseal by carefully stretching it away from the lip of the earcup shell 3 Replace the earseal 4 Install the earseal by carefully stretching it over the lip of the earc...

Page 32: ...c Remove both earcup assemblies from the helmet d Remove the TPL from the helmet e If replacing the nape straps remove the clamps from the nape straps and set aside f Remove the screws washers and T...

Page 33: ...mber preference d Pass the double D ring nape strap through the nape pad from lower right to upper left if installed on right or from lower left to upper right if in stalled on left NOTE Before instal...

Page 34: ...the chinpad is tacked to the chinstrap cut the tacking d Slide chin pad off chin strap e Discard unserviceable components 2 Reassemble the chin strap assembly or chin pad as follows NOTE When reinsta...

Page 35: ...m Swivel Assembly MATERIALS REQUIRED QUANTITY DESCRIPTION REFERENCE NUMBER 1 Boom Swivel 78A4047 1 Adhesive MIL A 5540 1 On the side of the helmet to which the boom swivel assembly is mounted pull the...

Page 36: ...f the helmet shell 6 Using adhesive MIL A 5540 reattach the pile fastener to the helmet shell 7 Reinstall the earcup 8 Check earseal compression and helmet fit in accordance with paragraph 2 2 3 15 Fi...

Page 37: ...the earcup from the side of the helmet where the bayonet receiver is to be replaced b Pull pile fastener fabric inside helmet shell assembly away from area where earcup assembly was removed c Remove t...

Page 38: ...hers through the backplate from the inside of the helmet shell assembly Attach jaw receiver and spacer to outside of the helmet shell assembly Ensure that projections on jaw receiver are pointing towa...

Page 39: ...e the energy absorbing liner b Detach the right and left earcup assemblies from the pile fastener tape in helmet shell earcup cavity and position clear of work area c Remove the panhead screws flat wa...

Page 40: ...er into place ensuring that the rear edgeroll is not pinched or curled under the liner d On inside surface of the energy absorbing liner install front and rear hook fastener tapes All four fasteners s...

Page 41: ...ng etc to be replaced see Figure 4 9 1 Remove four screws two screws each side from dual visor assembly and carefully remove assembly from helmet NOTE Prior to disassembling the dual visor assembly no...

Page 42: ...OUSING TRACKS SCREWS TWO EACH SIDE OUTER VISOR INNER VISOR OUTER VISOR LOCK ASSEMBLY SPACER NOTE In the exploded view above the visor lock is shown on the left side as worn The lock is normally instal...

Page 43: ...ote the order of parts you will assemble the dual visor in the same manner 1 Rotate the visor lock assembly a quarter turn so that the visor key will clear the visor cutout and the housing slot lift t...

Page 44: ...g without the visor align them over the posts protruding up ward from the helmet Re attach these parts to the helmet shell with the six screws 7 Slide the visor into the tracks Align the visor lock ov...

Page 45: ...ter turn so that the visor key will clear the visor cutout and the housing slot lift the lock assembly away from the visor assembly 2 Align the replacement visor lock assembly over the housing slot in...

Page 46: ...y a quarter turn so that the visor key will clear the visor cutout and the housing slot lift the lock assembly away from the visor assembly 2 Slide the visor out of the tracks 3 Slide the replacement...

Page 47: ...visor strap at the tab 2 Pull the strap away from the helmet 3 Repeat for the other strap 4 Referring to Figure 3 25 install the new visor by fastening the visor snap to the inner visor snap from fro...

Page 48: ...arcup assembly 3 Remove the hardware attaching the snap fastener to the helmet shell NOTE Before reinstalling screws apply a small amount of RTV to the ends of each screw 4 Install the replacement sna...

Page 49: ...ration All other numbers which are preceded by hyphens for example 1 2 and so forth correspond to index numbers numbered callouts on the associated illustration 4 2 2 Part Number Column The Part Numbe...

Page 50: ...4 2 1 3 1 4 2 5 6 Figure 4 1 HGU 84 P Commercial Helmet Assembly...

Page 51: ...e Large See Figure 4 2 for breakdown 1 B E HELMET SHELL ASSY White X Large See Figure 4 2 for breakdown 1 C F HELMET SHELL ASSY White X Large Wide See Figure 4 2 for breakdown 1 J 2 HELMET SHELL Gray...

Page 52: ...F B E HELMET SHELL ASSY X Large REF C F HELMET SHELL ASSY X Large Wide REF HELMET SHELL Medium Not available as an assembly REF G HELMET SHELL Large Not available as an assembly REF H HELMET SHELL X L...

Page 53: ...G 90C7864 2 CHIN NAPE STRAP ASSY Large See Figure 4 5 for breakdown 1 B E H 90C7864 3 CHIN NAPE STRAP ASSY X Large See Figure 4 5 for breakdown 1 C F I 90C7864 4 CHIN NAPE STRAP ASSY X Large Wide See...

Page 54: ...THERMOPLASTIC LINER ASSY Large REF B E H 85D7087 3P THERMOPLASTIC LINER ASSY X Large REF C F I 1 85D7088 1 COVER ASSEMBLY Medium 1 A D G 85D7088 2 COVER ASSEMBLY Large 1 B E H 85D7088 3 COVER ASSEMBL...

Page 55: ...TS PER ASSEMBLY USABLE ON CODE 4 4 90C7885 EARCUP ASSEMBLY REF 90C7886 1 EARCUP Left hand Not Shown 1 1 90C7886 2 EARCUP Right hand 1 2 79C4401 1 EARPHONE HOLDER 2 3 88C7589 EARSEAL 2 4 67A1809 2 GROM...

Page 56: ...4 8 1 2 3 4 5 6 11 11 7 8 9 10 HELMET SHELL REF NAPESTRAP NAPESTRAP PAD Figure 4 5 Chin Nape Strap Assembly...

Page 57: ...STRAP PAD Black X Large 1 C F I 90D7865 4 NAPE STRAP PAD Black X Large Wide 1 C F I 3 90B7866 1 NAPE STRAP Double D ring Medium 1 A D G 90B7866 2 NAPE STRAP Double D ring Large X Large 1 B C E F H I 9...

Page 58: ...4 10 1 3 2 13 SEE DETAIL 5 7 12 SEE DETAIL 6 8 13 12 DETAIL 9 10 4 11 Figure 4 6 Dual Visor Assembly with Quick Disconnect...

Page 59: ...WER TRACK Left Hand 1 6 90D7934 2 LOWER TRACK Right Hand 1 7 90C7935 1 UPPER TRACK Left Hand 1 8 90C7935 2 UPPER TRACK Right Hand 1 9 90C8029 1 DETENT SPACER Left Hand 1 10 90C8029 2 DETENT SPACER Rig...

Page 60: ...4 12 Figure 4 7 Single Visor Assembly 1 2 3 4 6 5 7 8 9...

Page 61: ...S Neutral Medium 1 D 79D4406 1 VISOR LENS Neutral Large 1 E F 3 79D4405 2 VISOR LENS Clear Medium Optional 1 D 79D4406 2 VISOR LENS Clear Large Optional 1 E F 4 79B4397 1 SPACER Inner Medium 2 D 79B43...

Page 62: ...PUBLICATION TP0131 REV 2 JUNE 2001...

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