Rights....ha, you have none! Flying is a privelege, not a right, so you don't have a lot of "rights."
Hopefully, the ramp check is only a formality and you just happened to be at the wrong place at the wrong time. In that case just be polite, and do what the inspector says, he'll want to see your licence and medical, want to know the aircraft's inspection status and go on his merry way, looking for the next "victim" he can "help."
On the other hand if you are "under observation" you can expect anything.
Best advise to protect yourself is to have your paperwork in order!
Here's the Inspector's Handbook chapter on 91 ramp checks:
5. PROCEDURES.
A. PTRS. Open PTRS file.
B. Preinspection Activities.
(1) Review the office file on the operator to determine if any prior violations of the FAR, past complaints, or inspection reports exist.
(2) Note review findings and any areas of emphasis on the FAR Part 91 job aid.
C. Location of Inspection. Proceed to the airport where the ramp inspection will be conducted. Determine whether or not it is necessary to identify FAA presence to the airport operator or other operators on the airport. (Figure 56-4) Use the FAR Part 91 job aid to conduct the ramp inspection.
D. Inspect Airman Documents.
(1) Inspect airman certificates to determine appropriate ratings and limitations for the type of operations being conducted.
(2) Determine if certificates are genuine and legible. (See Chapter 1, Introduction to FAR Part 61 Related Tasks.)
(3) Inspect airman medical certificates to determine if they are current and the appropriate class. Check for a Statement of Demonstrated Ability, if required, on the medical certificate.
(4) If available, examine pilot logbooks (or other reliable records) to determine recency of experience and qualifications, for example -
(a) Biennial flight review
(b) Instrument proficiency check
(c) PIC proficiency check
(5) If applicable, inspect pilot Category II and/or Category III authorization letters for currency. (FAR 91.189)
(6) Note any discrepancies on the job aid.
E. Record Aircraft Information. Record the N-number, make and model, and whether leased or owned on the job aid. If the vehicle is an ultralight, see Chapter 66, Inspect an Ultralight Vehicle.
F. Inspect Aircraft. (Applies to all aircraft)
(1) Determine that the proper airworthiness certificate is displayed at the cabin or cockpit entrance. Note that it is legible to passengers and/or crew.
(2) Examine the registration certificate to ensure that it is issued for that specific aircraft. Determine that the N-number on the certificate matches the N-number on the aircraft. Check that the certificate is issued to the present owner of the aircraft.
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(3) Check the radio station license and note its expiration date. If it has expired, inform the operator of the pertinent FCC requirements.
(4) Determine that there is a current, approved Airplane Flight Manual (AFM) on board the aircraft.
(5) Determine if there is current weight and balance information in the aircraft by examining the AFM. Compare equipment listed on the weight and balance form to the actual equipment installed.
(6) If applicable, check the MEL to determine that it has:
(a) Been issued by N-number and serial number to the aircraft operator
(b) A Letter of Authorization from a district office; check deferred items for placards and dates (Refer to Chapter 58, Approve a Minimum Equipment list.)
(7) If a Letter of Deviation from FAR Part 125 has been issued, ensure that a true copy is in the aircraft.
(8) If the aircraft is leased, determine that a copy of the lease agreement or contract is being carried in the aircraft. Note the expiration date on the lease and determine if the lease is still valid.
(9) If applicable, determine that copies of the approved Category II or Category III authorization and manual are in the aircraft.
(a) Review the Category II/III authorization and provisions.
(b) Check that the aircraft make, model, and N-number is listed.
(c) Consider any instrument, airport, or weather requirements listed there or in the manual.
(10) If the aircraft operates under a letter of authorization for (NAT)(MNPS) North Atlantic Minimum Navigation Performance Specification airspace, determine if the letter is carried on board the aircraft.
(11) Determine if pertinent and current aeronautical charts are available.
(12) Ask the operator what type of instrument operations are conducted, for example: ILS, DME, RNAV. Determine if the required radio and navigational equipment is installed for the specific operations conducted.
G. Inspect Aircraft.
(1) Determine the general airworthiness of the aircraft by inspecting the aircraft's exterior in a manner similar to a preflight inspection.
(2) Inspect seats and safety belts for installation and condition.
(3) If applicable, determine if a current VOR Equipment Check has been performed.
(4) Determine if an ELT (Emergency Locator Transmitter) is installed. Check the expiration date of the battery.
(5) Determine that the aircraft identification plate exists and is secured to aircraft fuselage exterior. (FAR 45.11(a))
H. Inspection Items for Large and Turbine Powered Multiengine Airplanes Only. In addition to the items in Paragraphs E(1) through (12) and F(1) through (4), inspect the following items:
(1) Determine if the aircraft has an emergency checklist available to the flight crew.
(2) Determine if the aircraft has one engine inoperative climb performance data available to the flight crew.
(3) Determine if pertinent and current aeronautical charts are available.
(4) Determine if a flashlight having two D-sized cell batteries, or equivalent, is accessible from the pilot station and in good working order.
(5) If the operator conducts overwater operations, determine that the required radio equipment is installed (FAR 91.511).
(6) For transport category aircraft only, have the operator demonstrate that the aural speed warning device is in operating condition.
(7) Have the operator activate the smoking and safety belt signs. Determine if they are in operable condition. Check operation from the cockpit and the cabin. If applicable, at this time conduct the altitude alerting system or device check.
(8) Note whether the operator uses passenger briefing cards to supplement oral briefings. If so, inspect the cards for location and correct information (FAR 91.519).
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(9) Determine if appropriate emergency equipment is on board the aircraft (FAR 91.513).
(10) If the operator conducts overwater operations, inspect the following survival equipment for installation and condition:
(a) Life preservers with approved survivor locator light (for each occupant)
(b) Liferafts with approved survivor locator light (amount should accommodate the number of occupants of the aircraft)
(c) Pyrotechnic signaling devices (for each liferaft)
(d) Emergency radio signaling device
(e) Lifeline
(f) Appropriately equipped survival kit
I. Inspection items for Turbojet Powered Civil Airplanes Only. In addition to the items in Paragraphs E(1) through (12), F(1) through (4), and Paragraph G(1) through (10), inspect the altitude alerting system or device for installation and operation. Conduct this test at the same time the smoking/safety belt sign and aural speed warning device test is accomplished.
J. Inspection Discrepancies. If a discrepancy is discovered during the inspection, enter it on the appropriate job aid in the remarks section.
(1) Inform the operator of the discrepancy. Advise the operator that if the aircraft is operated without correcting the discrepancy, he or she may be in violation of the FAR.
(2) If necessary, issue FAA Form 8620-1. (Figure 56-3)
(a) Attach the bottom card (buff) on the aircraft by the string. Place it so that the operator will easily see it.
(b) Return the top and middle sheet (both white) to the airworthiness unit.
K. Review Job Aid. Upon completion of the inspection, review the job aid for any suspected violations. If an enforcement investigation is necessary see Volume 2, Chapter 182 of this Handbook.
L. Conclude Inspection.
(1) Discuss any pertinent safety information with the pilots or operator.
(2) Return any documentation.
(3) Advise the pilot or operator of any upcoming accident prevention or other safety meetings.
(4) If no discrepancies were found, compliment the pilot or operator.
M. PTRS Report. Send a followup letter of correction (Figure 56-5) with a suspense date to remind a pilot or operator of noted discrepancies. Complete FAA Form 8000-36 in accordance with the PTRS field office manual. If the pilots or aircraft are not based in the inspector's district, forward a copy of the PTRS report and the job aid to the appropriate district office.
N. District Office File. File the job aids in accordance with normal office procedures.